In halogens, which of the following, increases from iodine to fluorine? d-block elements show variable oxidation states. As a result, the second ionisation enthalpy of magnesium is much smaller than that of sodium. The second electron gain enthalpy is positive because energy is needed to overcome the force of repulsion between monovalent anion and second incoming electron. For halogens it is highly negative, because they can acquire the noble gas configuration by accepting an extra electron. Which important property did Mendeleev use to classify the elements in this periodic table and did he stick to that? Answer: A cation is smaller than the parent atom because it has fewer electrons while its nuclear (d) 10. Do follow the following tips and suggestion to learn formulas easily. The Selina Concise ICSE Solutions for Class 6 Chemistry Chapter 4 will help you to solve Chapter End Questions, In Text Questions, Important Questions and Extra Questions. Ionic radius. (b) 3. What are its units? We have covered all the Class 11 Chemistry important questions and answers in the worksheets which are included in CBSE NCERT Syllabus. (ii)There are groups numbered from 1 to 18 from the left. For example. (b) Identify the element that would tend to lose two electrons. Which one of the following factors does not affect the valence shell? Ans. (c) Each block contains a number of columns equal to the number of electrons that can occupy that subshell. The formulae list covers all formulae which provides the students a simple way to study of revise the chapter. What are horizontal rows and vertical columns of the periodic table called? (ii)There were in all eight groups. In these elements the last electron is added to the third to the outermost energy level. Answer: Electron gain enthalpy of Cl is more negative than that of F. Question 7. (iii)There are seven horizontal rows called periods. The combining capacity of an element is known as valency. Atomic mass of Br =127 + 35.5/2 = 81.25. Thus, among B, C, N and F, non-metallic character decreases in the order: F > N > C > B. (d) The block indicates value of azimuthal quantum number (l)for the last subshell that received electrons in building up the electronic configuration. Question 5. Name two such triads. Chapter Wise Important Questions Class 11 Chemistry. Question 34. NEET Chapter wise weightage of important chapters for NEET 2021 helps you prepare and score better. 14. On moving down the group there is an increase in the principal quantum number and therefore no. They are elements of s-block and p-block. CBSE Class 11 Chemsitry Important Questions, Chapter 1 - Some Basic Concepts of Chemistry, Chapter 4 - Chemical Bonding and Molecular Structure, Chapter 12 - Organic Chemistry - Some Basic Principles and Techniques, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. (i) F–(ii) Ar (iii) Mg2+(iv) Rb+ Write the general electronic configuration of s. reacts with water to form perchloric acid which turns blue litmus red. Answer:  (a) Li02(Lithium oxide) (b) Mg3N2(Magnesium nitride) (i)There are in all 18 vertical columns i.e. Answer:  Electronic configuration of Na and Mg are Question 5. Na and K have similar physical and chemical properties because they have same number of valence electrons. electrons. Gain of an electron leads to the formation of an anion. Increase in comfort, pleasure and luxuries. Why do elements in the same group have similar physical and chemical properties? period = 3, Element’s name = Mg block = s, Group = II Electronic configuration of B (Z = 19) d-block —(n -1) d1 -10 ns0-2 4.Give the main features of p-block elements. Define and state Mendeleev’s periodic law. (c) Aluminium and iodine(d) Silicon and oxygen Ans. Thus the reactivity of metals goes on decreasing in a period from left right. Define a neutral oxide In contrast, the elements of group 17 have seven electrons in their respective valence shells and thus have strong tendency to accept one more electron to make stable configuration. Also it has only 1s2 2s1 orbital for bonding. (ii)Seaborg’s group? (a) Be and A1 (b) Mg and A1 (c) Li and Mg (d) B and P Ans.it increases from top bottom in a group. This also increases, the effective nuclear charge thus the value of ∆iH1 increases. Students your final exams are just around the corner. Physics formulas for Class 11 is one of the best tools to prepare physics for Class 11 examination and various competitive examinations. Answer: Ar, K+, CT, S2-, or P3- are isoelectronic with ca2+. How does it influence the ionization enthalpy ? 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