The sBlock Elements - Result Question 14
####15. Which one of the following properties of alkali metals increases in magnitude as the atomic number rises?
[1989]
(a) Ionic radius
(b) Melting point
(c) Electronegativity
(d) First ionization energy.
Topic 2: Some Important Compounds of Sodium
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Solution:
- (a) Within a group, ionic radius increases with increase in atomic number. The melting point decrease down the group due to weakening of metallic bond. The electronegativity and the $1^{\text{st }}$ ionization energy also decreases down the group.
