The atomic number and mass number of an element are 16 and 32 respectively

CBSE Class 9
1

The atomic number and mass number of an element are 16 and 32 respectively.

a)Find the number of protons, electrons and neutrons in it.
b)State its valency.
c)Is this element a metal or a non - metal?

2

a) No. of protons = atomic number = 16
No. of electrons = no. of protons = 16
No. of neutrons = Mass number - atomic number
= 32 - 16
= 16

b) Electronic configuration of element: 2, 8, 6
So, Valency = 8 - no. of valence electrons
= 8 - 6
= 2

c)The element is a non metal because it has 6 valence electrons and hence belongs to group 16.