Answer :

the number of protons must differ between two different elements
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Answer:

They must differ by having a different amount of valence electrons.

Explanation:

Valence electrons are the outermost electrons, and most atoms must have 8 atoms to be stable (except hydrogen and helium). This is called a covalent bond. Then, once the atoms share electrons, it forms a new element, like sodium and chlorine making salt, or NaCl. Or also like water, or H2O.

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