Question

a) Elements in the Periodic table show periodicity in properties . List any four such properties
b) Give reasons for the following :
i) No fixed position is assigned to hydrogen in the periodic table .
ii)Lithium atom is smaller than sodium atom.
iii) Chlorine (atomic Number : 17) is more electronegative than sulphur (Atomic Number : 16)​

Answer 1

Answer:

a) periodic properties are:

atomic radii

ionisation potential

electron affinity

Electronegativity.

Explanation:

b) i) because it resembles alkali metals by forming positive ions and resembles halogens by forming diatomic molecule.

ii) Li has 2 shells and Na has 3 shells. So Li is smaller than Na.

iii) chlorine has greater attraction for electrons than sulphur. It is more electronegative than sulphur.