Which of these will not form a positive ion in an ionic compound?

Name: Which of these will not form a positive ion in an ionic compound?
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Question

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Ba, Rb, Sn, and Mg are all metals and can form positive ions in an ionic compound by losing one or more electrons. P is a non-metal and tends to gain electrons to form a negative ion rather than losing electrons to become a positive ion. Therefore, P will not form a positive ion in an ionic compound.

Which of These Will Not Form a Positive Ion in an Ionic