Question

question 3 of 25 what is the mass number of neon (ne)? a. 10 b. 20 c. 18 d. 2

Explanation:

The most common isotope of neon has 10 protons and 10 neutrons. Mass number is the sum of protons and neutrons, so 10 + 10 = 20.

Answer:

B. 20