Question

An atom of an element with atomic number 18 and mass number 40 has the following articles:
(A) 18 protons, 18 electrons, 22 neu­trons
(B) 18 protons, 22 electrons, 18 neu­trons
(C) 22 protons, 18 electrons, 18 neu­trons
(D) 22 protons, 22 electrons, 18 neu­trons

Answer 1

Answer:

The answer is- a

We know that atomic number=number of protons= number of electrons

Therefore, Protons=electrons=18 and neutrons are 22