Question

The number of valency electrons and the
valency with respect to hydrogen are equal for
1) Sulphur
2) Silicon
3) Phosphorus 4) Chlorine​

Answer 1

Answer:

valency electrons of sulphur is 6

valency is 2

valency electrons of silicon is 4

valency is 4

valencyelections of phosphorus is 5

valency is 3 or 5

valency electrons of chlorine is 7

valency is 1

Explanation:

thankyou

Answer 2

Answer:

Valence Electrons are the total number of electrons in the outermost shell.

Valency of an element is its combining capacity.

Number of valence electrons in silicon is 4. Its compound with hydrogen is SiH4

​

. Valency of silicon is  4.

In case of sulphur, valence electrons are 6. Compound formed is H 2S. Valency of sulphur is  2.

In case of phosphorus, valence electrons are 4. Compound is PH3

​ ,(PH 5  does not exist). Valency of phosphorus is 3.

In case of chlorine,  valence electrons are 7. Compound formed is HCl. Valency of chlorine is 1.

Thus, only in case of Si, both the number of valence electrons and valency is the same with respect to hydrogen.

Therefore, the option is B.