Question

Which has more mass - the nucleus or electron cloud?

Answer 1

The nucleus contains the massive particles.

Explanation:

If you look at the masses of fundamental particles, the mass of the proton and the neutron dwarf that of the electron. Mass of proton/neutron, `1.67xx10^(-27)*kg`; mass of electron, `9.11xx10^(-31)*kg`; so approx. 4 orders of magnitude difference.