Question

A Helium atom has 2 protons in the center of its nucleus. Therefore its atomic number is 2. Its mass is

greater than the mass of these 2 protons. Which of the following accounts for this difference in mass?
A neutrons
B molecules
C nuclei
D electrons

Answer 1

Answer: Electrons

Why? Neutrons don’t have a mass and cannot change it. Molecules don’t make since and same with nuclei so it must be electrons.
Also It is good to know that protons and electrons are parts of an atom that have a mass.

Hope this helps :D

Answer 2

I dont know for sure, but I would have to say electrons. Please tell me if I'm wrong