Question

Number of neutrons in 37 cl 17

Answer 1

Neutrons =mass-atomic no
=37-17=20 neutrons

Answer 2

An element is represented by notation :

A
X
Z
Where A= mass number = number of
Protons+ neutrons
Z= atomic number = number of protons= number of electrons.

Now given element is
37
Cl
17
Number of protons=17
Mass number = 37
So number of neutrons=mass number- number of neutrons=
37-17=20
Number of neutrons=20