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What is the charge on he helium atom? Explain your reasoning. (A helium atom has two electrons, two protons, and two neutrons.)
A helium atom has no charge, which means it has an oxidation number of 0. Neutrons have no charge. Since the numbers of protons and electrons are equal, the positive charge of the protons and the negative charge of the electrons add up to zero. ##"2p"^+"+ 2e"^(-)"## = ##"0"##. Therefore, a helium atom with two electrons, two protons, and two neutrons has no charge.