What is the cause of periodicity in properties of the elements? 23. (d) Number of core electrons. On moving down the group their reactivity increases. 20.How does electronegativity and non – metallic character related to each other? (ii) Noble gases have positive value of electron gain enthalpy. O (g) + e– —> O– (g) (∆ eg H = – 141 kJ mol -1) (e)9. Answer: Question 25. Elements A, B, C and D Iwoe atomic numbers 12,19, 29, and 36 respectively. Answer: (d) is incorrect. Ionisation enthalpy =E∞–E ground state Van der waal’s radius > Metallic radius > covalent radius. Read on to find out Selina Concise Chemistry Class 6 Book ICSE Solutions Chapter 4 Elements, Compounds, Symbols And Formulae. 12. Mg = 1s 2 2s 2 2p 6 3s 2. of sodium is higher than that of magnesium. Question 5. Fourth and fifth period contains 18 elements each namely 19K to 36Kr and 37Rb to 54Xe and is a long period. Loss of an electron from an atom results in the formation of a cation. As we move from O to F the atomic size decreases. The revision notes covers all important formulas and concepts given in the chapter. A cation is smaller than its parent atom because it has fomer electrons while its nuclear charge remains the same. Considering the elements B, C, N, F and Si, the correct order of their non-metallic character is: (a) B>C>Si>N>F (b) Si>C>B>N>F (c) F>N>C>B>Si (d) F>N>C>Si>B Class 9 Chemistry Formulas - View presentation slides online. The distance from the centre of nucleus to the outermost shell o electrons in the atom of any element is called its atomic radius. Energy of an electron in the ground state of the hydrogen atom is- 2.18 x 10-18 J.Calculate the ionization enthalpy of atomic hydrogen in terms of JMol-1. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. Ans. 19. Answer: General electronic configuration of f-block elements =(n – 2) f1-14 (n -1) d0-1 ns2. Mg = 1s2 2s2 2p6 3s2 (a) gains an electron (b) loses an electron ? Answer:  Electronic configuration of Na and Mg are Thus the radius of Na+will be less than the Na. This also increases, the effective nuclear charge thus the value of ∆iH1 increases. (c) electron-electron interaction in the outer orbitals (e) Phosphorous pentafluoride (f) Element 71 and fluorine. Discuss the factors which influence the electron gain enthalpy. NCERT books Solutions, notes and assignments according to current CBSE syllabus, are also available to download along with the answers given at the end of the book. Ans.Electronegativity is directly related to the non – metallic character of elements. Write the atomic number of the element present in the third period and seventeenth group of the periodic table. Ans. As a result  ∆iH1 of N is higher than that of O. Which of the following oxides is neutral? How do metals react in a group? Why are electron gain enthalpies of Be and Mg positive? M(g) + e– ———————>M– (g) Answer: The element is chlorine (Cl) with atomic number (Z) = 17. 4.Give the main features of p-block elements. Atomic mass: 7          23              39 Answer: Ionization Enthalpy. They are generally paramagnetic in nature. Question 16. Students can find the CBSE Important Questions Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties here. Ans. Answer: Question 27. For example, gives CT ion which does not have stable inert gas configuration, consequently, the energy released is much higher in going from Chapter 4 Chemical Bonding And Molecular Structure. For these reasons, the energy required to remove an electron from magnesium is more than the energy required in sodium. (ii)There were in all eight groups. cl2 O7). Question 8. You can check the detailed explanation of all questions of exercises, examples and miscellaneous by clicking on the Exercise link below.We had learned Basics of Trigonometry in Class 10. Name two such triads. Assign the position of the element having outer electronic configuration, On the basis of atomic numbers it easier to remember all the elements. Since the ionization enthalpy decreases down the group therefore, the reactivity of group 1 elements increases in the same order Li < Na < K < Rb < Cs. Important Formulas all chaptersof Chemistry Class 11 & 12. in all nine elements. (i) O or F (ii) F or Cl. Mg+ = 1s2 2s2 2p6 3s1 Question 1. The first electron gain enthalpy of oxygen is negative because energy is released when a gaseous atom accepts an electron to form monovalent anion. In a group, the valency of an element remains constant while in a period it increases from left to right. CO). General electronic configuration is (n – 1) d1-10  ns1-2. Why. Why does the ionization enthalpy gradually decreases in a group? Factors on which electron gain enthalpy depends: Question 4. It has elements of groups 1 and 2. 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