Question

The mass number of an atom is 37. Its M shell contains 7 electrons.
What is the number of neutrons in the above atom?

Answer 1

Answer:

20 is the correct answer

Explanation:

Given - Atomic number of element = 17

Mass number of element = 37

Number of electrons = 17

As we know, number of protons is equal to number of electrons.

so, number of protons = 17

now, Mass number = number of protons + number of neutrons

37 = 17 + number of neutrons

number of neutrons = 37 - 17

number of neutrons = 20

So, the number of neutrons in the nucleus = 20.