Respuesta :
the right answer is the third. C the number of protons
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i hope this help! hope and nice day.
please click the thanks button
The answer is could either be protons or the atomic number.
The number of protons equals the atomic number on the periodic table. Every atom of a particular element contains the same number of protons. Each element has a unique atomic number, or a unique number of protons in its nucleus.
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