Which statement best describes why electrons are typically not included when determining the mass of an atom?
the charge of a proton cancels the charge of an electron.
the protons and neutrons are much more massive than the electrons.
electrons have a negative charge.
electrons are located outside the nucleus.

The correct answer is d = Electrons are outside the nucleus.

Explanation:

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The mass of the atom is measured as the number of protons and neutrons in the nucleus of an atom.

Since electrons are outside the nucleus, they are not counted to know the mass.

The correct answer is d = Electrons are outside the nucleus.

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