Question

a neutral isotope has

• the same number of protons, neutrons and electrons
• the same number of protons, but different numbers of neutrons and electrons
• the same number of protons and electrons, but different numbers of neutrons
• different numbers of protons, neutrons and electrons

Explanation:

Atoms are neutral when the number of positively - charged protons equals the number of negatively - charged electrons. Isotopes of an element have the same number of protons but different numbers of neutrons. So a neutral isotope has the same number of protons and electrons, but different numbers of neutrons.

Answer:

The same number of protons and electrons, but different numbers of neutrons