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

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

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

mass of a proton, neutron and electron

What is the mass number of an isotope equal to?Choose 1 answer:Choose 1 answer:(Choice A)   the number of protons plus the number of neutronsAthe number of protons plus the number of neutrons(Choice B)   the number of protons plus the number of electronsBthe number of protons plus the number of electrons(Choice C)   the number of protons minus the number of neutronsCthe number of protons minus the number of neutrons(Choice D)   the number of protons minus the number of electronsDthe number of protons minus the number of electrons

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