Question

a certain atom has 20 electrons, 20 neutrons, and 20 protons. what is the atomic mass of the atom?

Explanation:

Step1: Recall the formula for atomic mass

Atomic mass = number of protons + number of neutrons.

Step2: Substitute the given values

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

Step3: Calculate the result

\(20+20 = 40\).

Answer:

A. 40