Write the atomic number and electronic configuration of the following elements.

(i) Sodium

(ii) Chlorine

(iii) Neon

(iv) Magnesium

Q.

Write the atomic number and electronic configuration of the following elements.

(i) Sodium

(ii) Chlorine

(iii) Neon

(iv) Magnesium

Q. (a) Write down the electronic configuration of (i) magnesium atom, and (ii) magnesium ion.
(At. No. of Mg = 12)
(b) Write down the electronic configuration of (i) sulphur atom, and (ii) sulphide ion.
(At. No. of S = 16)

Q. (a) Write down the electronic configuration of (i) sodium atom, and (ii) chlorine atom.
(b) How many electrons are there in the outermost shell of (i) a sodium atom, and (ii) a chlorine atom?
(c) Show the formation of NaCl from sodium and chlorine atoms by the transfer of electron(s).
(d) Why has sodium chloride a high melting point?
(e) Name the anode and the cathode used in the electrolytic refining of impure copper metal.

Q.

Arrange the elements with the following electronic configurations in the increasing order of electron affinity

(i) $1s^{2}2s^{2}2p^3$ (ii) $1s^{2}2s^{2}2p^4$ (iii) $1s^{2}2s^{2}2p^5$ (iv) $1s^{2}2s^{2}2p^{6}3s^{2}3p^4$