Which of the following is largest ion? a. Ci
D. S2
C. Na+
d. F
Which of the following is not iso-ele

answer = s2

explanation = all of these ions contain 18 electrons each so these are isoelectronic. For isoelectronic ions smaller the positive nuclear charge greater is the size of the ion.

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

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