The position of certain elements in the Modern Periodic Table are shown below.

	1	2	3 to 12	13	14	15	16	17	18
1	G								H
2	A			I			B		C
3		D			E				F

Using the above table answer the following questions giving reasons in each case :(i) Which element will form only covalent compounds?(ii) Which element is a non-metal with valency 2?(iii) Which element is a metal with valency 2?(iv) Out of H, C, and F which has the largest atomic size?(v) To which family does H, C and F belong?

(i) Element E is Silicon. It will form only covalent bonds only. The outermost orbit of silicon has 4 electrons and needs 4 more electrons to become stable.

(ii) Nonmetal with valency 2 is B, which is oxygen. Oxygen has high electronegativity.

(iii) Element D is a metal with valency 2. Hence, it is magnesium.

(iv) Element F has the largest atomic size. According to the electronic configuration of element F which is Argon, it occupies 3 energy shells compared to element H and C.

(v) Element H, C and F belong to group 18 which means according to their electronic configuration their octet is complete. Hence, they are stable. 

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Updated on: 10-Oct-2022

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