The mass of the neutron is approximately equal to the mass of the: protonelectronnucleus

Select the option that best completes the sentence.The mass of the neutron is approximately equal to the mass of the: protonelectronnucleus

mass of a proton, neutron and electron

hat is the mass number of the xenon isotope with   neutrons?

Compared to mass of lightest particle in nucleus (Proton) the mass of an electron is aboutA 1/80 B 1/360 C 1/1840 D 1/1000

Isotopes of an element have different mass numbers. Complete the sentence to explain why.  Because they have different numbers of:neutronsprotonselectrons