Question

In an element 'X', 5th electron of
3rd shell is its last electron. In
another element 'Y', 7th electron
of3rd shell is its last electron.
Then (a) Identify 'X' and 'Y'. (b)
Write the formula of the
compound formed by the
combination of 'X' and 'Y'. (C)
What is the atomicity of 'X' and'
'Y? (d) Find the ratio of number
of neutron of 'Y' to 'X'.​

Answer 1

Explanation:

Y−Third period

∴ Shells =3

Total electrons in valence shell 2+1=3 (2 electrons in s+1 electrons in p)

Valency of x is −1 (1 electrons is received - electro negative atom)

Therefore they combine to form compounds with chemical formula YX3 (Symbol of electropositive element first followed by electro negative element.)