Question

If an individual proton has mass 1.007825 amu, and an individual neutron has mass 1.008665 amu, what’s the calculated mass of a neptunium-236 nucleus?

a. 237.04817
b. 237.96682
c. 237.99873
d. 237.92482

Answer 1

The correct answer is (c).

Step-by-step explanation:

The mass of a neptunium-236 nucleus is calculated by adding the masses of the protons and neutrons in the nucleus. There are 92 protons and 144 neutrons in a neptunium-236 nucleus, so the total mass is 92 * 1.007825 + 144 * 1.008665 = 237.99873 amu.