Question

Which particles account for most of the mass of an atom?

a.

electrons

c.

electrons and neutrons

b.

electrons and protons

d.

protons and neutrons

Answer 1

unfortunately you kind of just have to know/memorize this

the majority of the atom's mass comes from the nucleus. do you remember which two particles make up the nucleus?

https://flexbooks.ck12.org/cbook/ck-12-middle-school-physical-science-flexbook-2.0/section/3.2/primary/lesson/atomic-nucleus-ms-ps