,Ra+2,Se+2,Ca+2,Ba+2 ?
I would rank these in size from large to small as
Ra^2+
Ba^2+
Ca^2+
Se^2+
You should Google and confirm.
As one goes down the periodic table in a column size increases.
As one goes across the periodic left to right the size decreases. Ca and Se are in the same period
Arrange the following cations in order of decreasing size,Ra+2,Se+2,Ca+2,Ba+2 ?
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