Question

Write the number of neutrons in
37
Cl???
17

1.17
2.37
3.54
4.20

Answer 1

Correct Answer is -- option d ----20

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

Answer 2

The correct answer is option 4 - 20 neutrons.

A (mass number) = p (number of protons) + n (number of neutrons)

The mass number (A) is given as - 37 (Chlorine - 37)

The number of protons is the atomic number (p) = 17

So, by putting the given values in the equation:

37 = 17 + n (number of neutrons)

n (number of neutrons) = 37 - 17 = 20

Therefore, n (number of neutrons) = 20