How many subatomic particles would a neutal atom have if its atomic number was 23 and its mass number was 57?

a) 80 neutrons, 23 protons, 34 electrons

b) 57 neutrons, 23 protons, and 23 electrons

c) 23 neutrons, 57 protons and 57 electrons

d) 34 neutrons, 23 protons and 34 electrons

e) 34 neutrons 23 protons and 23 elecrrlns

e) 34 neutrons 23 protons and 23 electrons

Explanation:

Atomic number = number of electrons = number of protons

So the atom contains 23 protons and 23 electrons

To find the number of neutrons we make use of the formula

Mass number - atomic number = number of neutrons

So 57 - 23 = 34 neutrons

Atom contains 23 protons, 23 electrons and 34 neutrons

Option e is the answer.