Question

a] Calculate the number of neutrons present of an element X which is represented as 16X
31
.

Answer 1

Here, atomic number = 16 =electrons=protons

Mass Number = 31

Number of neutrons + number of protons= Atomic mass number.

∴ Number of neutrons =31 − number of protons

=31 − 16

= 15

Answer 2

Here, atomic number = 16 = electron = protons

Mass number = 31

Number of Neutrons + Number of protons = Atomic mass of number

Therefore, Number of Neutrons = 31-16=15