Rank the following atoms and ions
Li+, Be2+, He, H−, B3+
in order of decreasing size.

1. H−, He, Li+, Be2+, B3+
2. B3+, Be2+, Li+, He, H−
3. H−, Li+, He, Be2+, B3+
4. B3+, Be2+, He, Li+, H−
5. He, H−, Li+, Be2+, B3+

I don’t understand how you know because the number of electrons are the same.

Rank the following atoms and ions
Li+, Be2+, He, H−, B3+
in order of decreasing size.

1. H−, He, Li+, Be2+, B3+
2. B3+, Be2+, Li+, He, H−
3. H−, Li+, He, Be2+, B3+
4. B3+, Be2+, He, Li+, H−
5. He, H−, Li+, Be2+, B3+

I don’t understand how you know because the number of electrons are the same.