What does the number of valence electrons an atom has have to do with whether the atom will gain electrons or lose electrons?

A valence number of 1 means that an alement will generally react to lose one electron to obtain a full outer shell.

Group two elements are assigned a valence number of 2. A valence number 2 means that a group two elements will generally react to lose two electrons to obtain a full outer shell.

Explanation:

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it would be c. predictability