Question

if an atom has 10 protons, 10 neutrons, and 10 electrons, what is the mass of the atom? 10 20 30

Explanation:

Step1: Recall atomic mass concept

The mass of an atom is approximately the sum of the number of protons and neutrons (electrons have negligible mass).

Step2: Calculate atomic mass

Given protons = 10, neutrons = 10. So mass = protons + neutrons = \(10 + 10 = 20\).

Answer:

B. 20