Question

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Answer 1

Answer:

i E²O

ii E²X³

iii EH²

Explanation:

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Answer 2

Explanation:

E= element of that group

1) valency of elements in first group is 1

Therefore its oxide(O) is : EO

(Oxide of hydrogen is considered same as water)(exception)

2)valency of elements of group 13 is 3

Therefore there formula with halides (X)

: EX3

3) valency of elements of group 15 is 3

Therefore there formula with hydrides(H)

: EH3