Question

31. An element X belongs to 2nd period & group 16 of the modern periodic table.
i)Determine the number of valence electrons & the valency of X.

ii)Molecular formula of the compound when X reacts with calcium & draw
its electron dot structure.

iii)Name the element X and state whether it is metallic or non-metallic.
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Answer 1

Answer:

The element is oxygen.....

atomic number-8

electronic configuration - 2,6

1.....valency-2

valence electrons-6

2.......electron dot structure is in given picture.....

when reacts with calcium it forms calcium oxide (CaO)

3......element x is oxygen and it is non metallic.....