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

(c) R

(d) S

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Solution

Ans:

P – 4: Has 2- valence electrons. Is an s-block metal. Can exhibit covalency and electro valency.

Q – 18: Has Octet configuration: Noble gas

R – 10: Has Octet configuration.: Noble gas

S – 16: Has valence 6 – electrons: Non-metal: Mostly shows covalency.

Beryllium metal with atomic number -4 can show electrovalency and covalency.

Compare to other elements of the group it behaves mostly covalent but with higher electronegative elements it can show electrovalency.

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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 (c) R (d) S

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

(c) R

(d) S