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 ICSE Class 9 Selina Solutions Atomic Structure and Chemical Bonding Ex 4E Q1. (a)           Define covalent (molecular) bond. View Solution (b)           Give an example of covalent bond formed by: (i) Similar atoms (ii) Dissimilar atoms View Solution Q 2.  Covalent bonds can be single, double or triple covalent bond. How many electrons are shared in each? Give an example of each type. View Solution Q3. Show number of bonds in: (i) Ethene molecule (ii) Ethyne molecule View Solution Q4.  An element A has 1 electron in its first shell. It combines with element B having 7 electrons in its third shell. What type of bond is formed? View Solution Q5.  Match the atomic numbers 4, 8, 10, 15 and 19 with each of the following: (a) Element which can form trivalent ion (b) An element with 4 shells. (c) Element with 6 valence electrons. (d) Element which does not form ion. View So...

  Question: In the formation of  (i) oxygen molecule  (ii) carbon tetrachloride molecule,  state the following:  (a) Electronic configuration of nearest inert gas attained.  (b) How many electrons are shared/transferred in bond formation?  (c) Which type of bonds these compounds form?  (d) Draw their orbital diagrams. Solution: (i)                      Oxygen molecule (a)          2, 8 (b)          2 pairs of electrons are shared (c)           Covalent bond (d)          Orbital diagram of oxygen molecule (ii)                    Carbon tet...

  Question: An element X has 2 electrons in its M shell, it forms bond with an element Y which has 7 electrons in its third orbit.  (a) Write the formula of the compound formed.  (b) Which nearest inert gas electronic configuration will element X and Y acquire.  (c) Show by orbital diagram the formation of compound between X and Y. Solution: (a)          XY 2 (b)          Element X will acquire the electronic configuration of Neon (2, 8), and element Y will acquire the electronic configuration of Argon (2, 8, 8). (c)           Orbital diagram for the formation of compound between X, which is magnesium and Y, which is chlorine. Explanation:   M shell means third orbit as the shells are named as K, L , M, ...     X has 2 electrons in its third shell, so its configuration will be 2, 8, 2. Y has 7 electrons in its third sh...

Question: Ion formed by gain of electron(s). Solution: Anion

Question: Bond formed by transfer of electron(s).   Solution: Electrovalent bond

Question: Elements having same mass number but different atomic number.   Solution: Isobars

  Question:   Atoms of the same element differing in mass numbers. Solution: Isotopes