How are two atoms of the same element alike?

1 Answer
anor277
Jan 28, 2017

They contain the same number of #"protons"#..............

Explanation:

They contain the same number of #"protons"#, positively charged, massive, nuclear particles. This definition allows for the existence of isotopes, whose atoms contain the same number of #"protons"# (and must do because they are isotopes of the same element), but DIFFERENT numbers of neutrons, neutrally charged, massive #"nucular particles"#.

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