Question

an element X belongs to group 15 and second period in the periodic table the atomic number of element is

Answer 1

Answer:

Explanation:

As the element belongs to Group 15, Valence electrons = 15-10=5

                                             Second period, so 2 Shells are the

                       ⇒ 2+5=7

                     Atomic number = 7

                   Element = Nitrogen (N)

Answer 2

Answer:

3+

Explanation:

since X belongs to group 15, therefore number of Valence electrons would be

15-10 = 5

and it belongs to period 2 that means it has only 2 energy shells this tells X doesn't show any variable valency

It needs 3 electrons to get stable according to octet rule

Hence valency of X would be 3+