What is the same for an atom of phosphorus-26 and an atom of phosphorus-27?

CHEMISTRY · Single correct · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties

Problem

What is the same for an atom of phosphorus-26 and an atom of phosphorus-27? (1) Atomic number and mass number (2) Number of protons and electrons (3) Number of neutrons and electrons (4) Number of protons and neutrons

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