Question

Predict the valence of following elements (A)atom number 5,(B)atom number 12,(C)atom number 14(,D)atom number 17

Answer 1

Valence electron

less such an electron has the properties of a valence electron. Thus, although a nickel atom has, in principle, ten valence electrons (4s2 3d8), its oxidation

Answer 2

we know electrons are filled by 2,8,8
so,
a) 2,3. valency-3
similarly
b)2
c)4
d)1