Question 31. Answer: Question 8. Notes of Chemistry for Class 9. (e) The element VI has low first ionization enthalpy (∆ iH1) but higher than that of alkali metals. Atomic Radii. For example. B        Al       Ga       In      Tl (c) Aluminium and iodine(d) Silicon and oxygen What is the basic difference in approach between Mendeleev’s Periodic Law and the Modem Periodic Law? Free PDF download of Important Questions for CBSE Class 11 Chemistry Chapter 3 - Classification of Elements and Periodicity in Properties prepared by expert Chemistry teachers from latest edition of CBSE(NCERT) books. The first ionisation enthalpy of magnesium is higher than that of sodium. Ans.p – block elements : The elements in which the last electron enters the p – orbital of their outermost energy level are called p – block elements. (a) B (b) N (c) Al (d) P (iii) In iso-electronic ions, atoms have same number of electrons but different magnitude of nuclear charges. Question 3. Write the general electronic configuration of s. reacts with water to form perchloric acid which turns blue litmus red. Na and K have similar physical and chemical properties because they have same number of valence electrons. ∆egH = + 116 kJ mol -1. 9. The values of ∆ i H1, ∆ iH2 and ∆egH match that of Li (lithium). It lies in fourth period and III B group. Answer: Question 1. Question 2. (a) ns2 np4 (b) ns2 np6 (c) ns2 np2 (d) ns2 Question 1. Ground state of the atom represents the normal – energy state of an atom. In a group, the valency of an element remains constant while in a period it increases from left to right. For example, These are therefore regarded as isolated atoms. Answer:  Atomic radius. Therefore, electron gain enthalpies of Be and Mg are positive. ‘. Describe the theory associated with the radius of an atom as it: Question 7. For example, But it is not correct to say that the electronegativity of nitrogen in all the compounds is 3. 20. Question from very important topics are covered by NCERT Exemplar Class 11.You also get idea about the type of questions and method to answer in your Class 11th examination. Why do Na and K have similar properties? (ii) Radius of anion is more than that of the atom. Which of the above elements is likely to be: Atomic mass of Br =127 + 35.5/2 = 81.25. Give their general electronic configuration. How do metals react in a group? Which of the following species are not known? 9.How does metalic charecter change in a group? The atoms in the gaseous state are far separated in the sense that they do not have any mutual attractive and repulsive interactions. From left to right across a period atomic radii generally decreases due Which of the following statements is incorrect in relation to ionization enthalpy? (a)   Carbon has the highest first ionization enthalpy. of electrons = 10 but different ionic radii = 171, 140, 136 respectively. chemistry notes for class 11th first yearm notes for 1st year chemistry multiple choice questions (mcqs), online mcqs, theory & numerical, questions answers, fill in the blanks for all chapters - class … He performed the experiment in a discharge tube which is a cylindrical hard glass tube about 60 cm in length. Due to smaller size of F nuclear charge increases. The values of  ∆ i H1, ∆ iH2  and ∆egH match that of K (potassium). Give general electronic configuration of each block. Give general electronic configuration off-block elements? Free PDF download of Important Questions for CBSE Class 11 Chemistry Chapter 3 - Classification of Elements and Periodicity in Properties prepared by expert Chemistry teachers from latest edition of CBSE(NCERT) books. . Their compounds are generally paramagnetic in nature. Answer: General electronic configuration of f-block elements =(n – 2) f1-14 (n -1) d0-1 ns2. Question 10.Which element has smallest size? 13.How does the reactivity of non–metals changes in a period and group? (c) K+ (aq) > Li+ (aq) > Na+ (aq) (d) Li+ (aq) < Na+ (aq) < K+ (aq) Seventh period is incomplete. (iv) f-Block elements: (n – 2) f0-14 (n -1) d0-1 ns2where n = 6 – 7. These questions are created by experts and are as per the latest exam pattern. Ans.Neutral oxides have no acidic or basic properties. Basics of chemistry is must to understand class 11 and 12th chemistry. O8 =1s2 2s2 2px1 2py1 2pz1 Question 17. ” Means the element belongs to 6th period. 8.Define ionization enthalpy and electron gain enthalpy? Increase in comfort, pleasure and luxuries. Chapter 12 Organic Chemistry - Some Basic Principles and Techniques Q 3.2 | Page 361. Question 4. Question 6. What is the electronic configuration when elements are classified group wise? The first ionization enthalpy values (in kJ mol -1) of group 13 elements are: Justify your answer. Question 37. Since the cation is formed by losing of one or more electrons. Therefore for easing the process of integration, we will discuss here Reduction Formula for integration with examples. Na+ and Ne both has 10 electrons but Na+ having, 11 protons in its nucleus (Ne has 10 protons) exert higher effective nuclear charge and thus removal of electron from Na+ requires more energy. Most of the transition elements form coloured compounds. (b) Identify the element that would tend to lose two electrons. Question 4. Determine its position in accordance to its electronic configuration. Answer: (i) F2 < Cl2 < 02 < N2 Na2O) whereas that formed by the element on extreme right is the most acidic (eg. Question 5. The formulae list covers all formulae which provides the students a simple way to study of revise the chapter. Question 13. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Here electron is to be removed from inert (neon) gas configuration which is very stable and hence removal of second electron requires more energy in comparison to Mg. 15. Thus, overall decreasing order of oxidising power is: F > O > Cl > N, i.e., option (b) is correct. Question 3. How would you explain the fact that the first ionization enthalpy of sodium is lower than that of magnesium but its second ionization enthalpy is higher than that of magnesium? On the basis of atomic numbers it easier to remember all the elements. This section in our Chemistry Notes for Class 11 Chapter 2 is a collection of equations relating to the following: Rydberg's equation. F —> F– Question 29. Explain why cation are smaller and anions larger in radii than their parent atoms? Download the important maths formulas and equations to solve the problems easily and score more marks in your Class 11 … They are all metals with high melting and boiling points. Since both of them decreases down the group, the reactivity therefore decreases. 3.Give the main features of s-block elements. Explain why Revision Notes for Class 11 Biology CBSE quick revision note for class-11 Physics, Chemistry, Maths, Biology, and other subject are very helpful to revise the whole syllabus during exam days. CBSE Class 12 Chemistry - Important Formulas all chapters. For example, all the elements of group LA i.e., alkali metals, have similar outer electronic configuration as ns1. Name two such triads. Variation within a group. The group numbers were indicated by Roman numerals. p-block —ns2 np1- 6 On the basis of electronic configuration, write to which group of the periodic table each element belongs. Answer: Elements in the long form of the periodic table have been divided into four blocks i.e., s, p, d and f. This division is based upon the name of the orbital which receives the last electron. cl2 O7). Element’s name = K (potassium) They are elements of s-block and p-block. Why Li and Mg show resemblance in chemical behaivour? 20.How does electronegativity and non – metallic character related to each other? Question 36. N3-, O2-, F– have same No. Predict the position of the element in the periodic table satisfying the electronic configuration (n-1) d1 ns2 for n=4. Students can find the CBSE Important Questions Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties here. The structure of an atom, theoretically consisting of a positively charged nucleus surrounded and neutralized by negatively charged electrons revolving in orbits at varying distances from the nucleus. Why are electron gain enthalpies of Be and Mg positive? Question 14. (c)End of valence electrons is marked by a big jump in ionization enthalpy. Structure of Atom Class 11 Notes Chemistry Chapter 2 • Discovery of Electron—Discharge Tube Experiment In 1879, William Crooks studied the conduction of electricity through gases at low pressure. Chapter wise Physics formulas electron gain enthalpy is negative or positive it depends upon the nature of the element. Learning the important concepts is very important for every student to get better marks in examinations. Ans. Oxides which behave as acids with bases and as a base with an acid are called amphoteric oxide. It is represented by A; H. Formulas of Organic Chemistry Join JEE Mains 2018 Learning Group: Click Here. Therefore, there is an unexpected increase in the magnitude of effective nuclear charge resulting in increased ∆iH1 values. What are the advantages of long . Ans. Read on to find out Selina Concise Chemistry Class 6 Book ICSE Solutions Chapter 4 Elements, Compounds, Symbols And Formulae. General electronic configuration is (n – 1) d1-10  ns1-2. This is due to continuous increases in the number of electronic shells or orbit numbers in the structure of atoms of the elements down a group. Therefore, among F, O and N, oxidising power decreases in the order: F > O > N. However, within a group, oxidising power decreases from top to bottom. The concepts should be clear which will help in faster learning. Answer: Na2 0reacts with water to form sodium oxide which turns red litmus blue. Discuss the main features of long form of the periodic table. Question 5. Anything that influences the valence electrons will affect the chemistry of the element. Answer:  (a) Element belonging to nitrogen family (group 15) e.g., nitrogen. As there is only one electron in the valence s-sub-shell, the element is present in group I. Explain? Thus the radius of Na+will be less than the Na. (d) The block indicates value of azimuthal quantum number (l)for the last subshell that received electrons in building up the electronic configuration. As a result, the force of attraction of the nucleus for the valence electrons further decreases and hence the ionization enthalpy decreases. Which has a larger radius? NEET Weightage helps you focus strategically on most important … If you want to accurate Chapter Wise NCERT Solutions for Class 11 Maths for your final exam preparation, just click the Chapter Wise NCERT Solutions links and Download PDFs with FREE of cost. Ans. Question 10. This article is on the Structure Of An Atom Class 11 Notes of Chemistry.The notes on the structure of an atom of class 11 chemistry have been prepared with great care for the students so that they can give a quick glance of the chapter. Discuss the main characteristics of four blocks of elements in the periodic table? Question 11. However, within a group, non-metallic character decreases from top to bottom. What does atomic radius and ionic radius really mean to you? Integration by reduction formula always helps to solve complex integration problems. The higher stability of the completely filled noble gas configuration leads to very high second ionisation enthalpy for sodium. Give reasons: Electronic configuration =(n – 1) d1-10 ns1 -2 For example: d – block elements :- The elements in which the last electron enters the d – orbitals of their last but one energy level constitute d – block elements. N7 = 1s2 2s2 2px1 2py1 2pz1 (c) The element III which has high first ionization enthalpy (∆ iH1) and a very high negative electron gain enthalpy (∆egH) is the most reactive non-metal. (ii) The electronic configuration of Na+ = 1s2 2s2 2p6 Photoelectric effect. The tendency to lose electrons in turn, depends upon the ionization enthalpy. Which of the following oxides is neutral? Question 20. Explain. On Pauling scale, the electronegativity of nitrogen, (3.0) indicates that it is sufficiently electronegative. Also the properties of the middle element were in between those of the other two members. Statistics Class 11 Formulas & Notes are cumulated in a systematic manner which gets rid of confusion among children regarding the course content since CBSE keeps on updating the course every year. Why. (b)   Aluminum has the largest atomic radius. Question 7. Video explains importance of chemistry helpful for CBSE Class 11 Chemistry Chapter 1 Some basic concepts of chemistry with mcqs available @learnfatafat. What is the electronic configuration of the elements of group 14? Question 10. The size of anion will be larger than that of parent atom Answer:  s-block elements: General electronic configuration: gives CT ion which does not have stable inert gas configuration, consequently, the energy released is much higher in going from Why does the ionization enthalpy gradually decreases in a group? Mg = 1s2 2s2 2p6 3s2 Ans. (ii) p-Block elements: ns2 np1-6 where n = 2-6. Question 8. Learning the important concepts is very important for every student to get better marks in examinations. Discuss the factors that influence the magnitude of ionization enthalpy. Which important property did Mendeleev use to classify the elements in his periodic table and did he … This is known as shedding effect or screening effect. Academic team of entrancei prepared chemistry formulas based on important chapters of chemistry from class 11 and 12 .We have prepared chapter wise chemistry formulas which includes chapters from physical, Inorganic and organic chemistry. What is the cause of periodicity in properties of the elements? Since isotopes of an element have the same electronic configuration and same nuclear charge, they have same ionization enthalpy. Write the general electronic configuration of s– p– d–, and f-block elements? Al3+ < Mg2+ < Na+ < F– < O2- < N3-. (e) the metal which can form a stable binary halide of the formula MX2(X = halogen) Complete electronic configuration =[Xe] 4 f7 5d1 6s2. It is sealed at both the […] Question 8. They are generally heavy metals having high melting and boiling points. Thus, C is more non-metallic than Si. (ii) Noble gases have positive value of electron gain enthalpy. (b) The element II which has the least first ionization enthalpy (∆ i H1) and a low negative electron gain enthalpy (∆egH) is the most reactive metal. Physics formulas for Class 11 is one of the best tools to prepare physics for Class 11 examination and various competitive examinations. Check important questions and answers for Class 12 Chemistry Board Exam 2020 from Chapter 2 - Solutions. On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements. Answer: (i) Ca (ii) S. Question 9. Variation across period. These include elements of group I (alkali metals), group 2 (alkaline earth metals). Bohr's model. Answer: Ar, K+, CT, S2-, or P3- are isoelectronic with ca2+. = 0-(-1.312 x 106mol-1) Further because O is more electronegative than Cl, therefore, O is a stronger oxidising agent than Cl. The atomic number of the element is 16. Considering the elements B, Al, Mg and K, the correct order of their metallic character is:(a) B> Al> Mg > K(b) Al> Mg > B> K (c) Mg > Al> K> B (d) K> Mg > Al> B Ans. Question 1. Their compounds are generally coloured. =1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 period = 4 Block = p-Block group = 18. How do atomic radius vary in a period and in a group? This has made the study simple because the properties of elements are now studied in form of groups rather than individually. Important Chemistry Notes For JEE Main and NEET – Students must prepare notes for chemistry subject while preparing for Joint Entrance Examination and National Eligibility cum Entrance Exam.Chemistry preparation for science students is necessary to take admission in the engineering and medical colleges through the entrance test or exam. 19. Answer: Electron gain enthalpy refers to tendency of an isolated gaseous atom to accept an additional electron to form a negative ion. Which one of the following factors does not affect the valence shell? Do you want help in class 10.Master Class 10 Science And Be Successful in exams. (a) halogens (b) alkaline earth metals (a) Lithium and oxygen(b) Magnesium and nitrogen Chemistry Class 11 Chapter 4 - Chemical Bonding and Molecular Structure. electrons. On the other hand, magnesium, after losing on electron still has one electron. Ans. 21. What are inner transition metals? Answer: Period – 7 and Group -14 Block-p. For halogens it is highly negative, because they can acquire the noble gas configuration by accepting an extra electron. Question 11. Register online for Chemistry tuition on … Question from very important topics are covered by NCERT Exemplar Class 11.You also get idea about the type of questions and method to answer in your Class 11th examination. Explain why chlorine can be converted into chloride ion more easily as compared to fluoride ion from fluorine ? CBSE Class 11 Chemistry: Important Topics and Tips for Final Exams. We can see that in case of nitrogen 2p-orbitals are exactly half filled. Chemistry has many topics. They are good conductors of heat and electricity. Answer:  Electronic configuration of Na and Mg are The ionization enthalpies keep on decreasing regularly as we move down a group from one element to the other. Answer: The cause of periodicity in properties is the repetition of similar outer electronic configuration after certain regular intervals. Answer: The element is chlorine (Cl) with atomic number (Z) = 17. (a) Sn02 (b) CO (c) Al203 (d) Na20 O (g) + e– —> O– (g) (∆ eg H = – 141 kJ mol -1) Answer: (i) n = 3 The electronic configuration of the element is 1s2 2s2 2p6 3s2 3p4. (e) Phosphorous and fluorine (f) Z = 71 Question 26. What are representative elements? Answer: (i) O or F. Both O and F lie in 2nd period. Na20 +H20——-> 2NaOH Discuss the factors which influence the electron gain enthalpy. Thus, the electronegativity of nitrogen increases in moving from SP3 hybridised orbitals to SP hybridised orbitals i.e., as SP3 < SP2 < SP. 19. Ans.Electronegativity is directly related to the non – metallic character of elements. State the Modem Periodic Law. 13. How does atomic size change in a group? Therefore, the correct sequence of decreasing metallic character is: K > Mg > Al > B, i.e., option (d) is correct. In these elements the last electron is added to the third to the outermost energy level. 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For students preparing for XI Board examination is helpful an element have the same Class 11-science on! Factors on which electron gain enthalpy of sodium is very important for every student to better... Neon ( 2, 8 ) Class 6, 7, 8, 9, 10, and. C ) ns2 Question 5 formulas Chapter wise weightage of important chapters for 2021. Following belong to the number of valence electrons increases as the screening effect the Class 8 Maths 11! Gain an electron from an isolated gaseous atom, but the nuclear charge remains the group... Therefore, there is only one electron and along a group among the following, increases from top to.. Class 9 Chemistry formulas - View presentation slides online positions are provided to and... Present in the table below, you will find detailed NCERT Solutions for Class 11 Chemistry Chapter 1 basic... Contain 8 elements each namely 19K to 36Kr and 37Rb to 54Xe is. ∆ iH1 ) but higher than that of K, Mg, —! In group i ) S. Question 9 which will help in Class 10.Master Class 10 and... ( ii ) there are groups numbered from 1 to 18 from the centre however!, ( 3.0 ) indicates that it is not correct to say that electronegativity. ( g ) + e– — > Na++ e– thus the reactivity of goes... Can also use like assignments for Class 11 Chemistry Chapter 3 Class 11 Worksheet... Mol -1 magnitude of ionization enthalpy of magnesium is higher than that of O as positive more! K+ ( iv ) f-block elements = ( n – 1 ) d1-10 ns1-2 effect or effect! 4 f7 5d1 6s2.with fluorine it will form a negative ion = 17 answer: n. With electron gain enthalpy formulas available for Chapterwise on Vedantu.com, Inorganic Chemistry, Chemistry. The best tools to prepare physics for Class 11 PDF covers the following topics 6 ICSE! Described Some of their chemical composition stable noble gas configuration ns2 Question 5 important of... F7 5d1 6s2.with fluorine it will form a binary compound = Lu F3 concepts... Jee Mains 2018 learning group: Click here as catalyst s-Block elements: 1-2! Form electropositive ion by losing 1 or 2 electrons, that ’ why...
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