do all elements except inert gases have both electrovalency and covalency

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There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The element which can exhibit covalency as well as electrovalency will be :

(a) P

(b) Q

(d) S

Noble gases are inert and do not form compounds like other elements because of their:

Indicate the nature of bonding in $C C l_{4} a n d C a H_{4}$

(a) How many electrons do inert gases have in their valence shells?

(b) Name an element of group 18 which can form compounds.

Q. which of the following compounds have electrovalent, covalent and co-ordinate bonds but do not have hydrogen bond:
a CaCl2. 2H2O
b..CuSO4.5H2O
c.FeSO4.7H2O
d Na2SO4.10H2O

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