Question

3.Zinc has an atomic number of 30 and a mass number of 65, how many neutrons does it have?

30
65
35
95

Answer 1

So your answer is 35 right okay so you subtract the mass number and the atomic number and that should always give you the neutrons

Answer 2

35

Step-by-step explanation:

Given parameters:

Atomic number of zinc = 30

Mass number of zinc = 65

Unknown

Number of neutrons = ?

Solution:

The mass number of an atom is the sum of its protons and neutrons;

Mass number = Protons + neutrons

Atomic number is the number of protons in an atom;

Atomic number = Protons

So;

Mass number = Atomic number + Neutrons

Neutrons = Mass number - Atomic number

Neutrons = 65 - 30 = 35

The number of neutrons in the atom is 35