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It would have 3 protons. Electrons are negative, and protons are positive so when they equal out it becomes neutral. And neutrons are neither positive or negative so they don't change anything.
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If a neutral atom has three electrons, then it must have three protons.
An atom is defined as the smallest unit of matter that forms an element.
A neutral atom is an atom that consists of an equal number of electrons and protons.
Electrons have a negative charge. Protons have a positive charge.
If a neutral atom has three electrons, then a neutral atom has three protons.
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