We’re being asked to Rank these atoms and ions according to radius.
Recall that ionic radius is the size of an ion. The trend for ionic radius is as follows: it increases from right to left and down a period in the periodic table. Ionic radius also increases with increasing number of electrons.
K-, K+ and K
Ranking from largest to smallest radius:
K- > K > K+
Sr2+ ,As3-,Se2-,Br- and Rb+
Because of this, the ionic radius will just depend on the charge of the ion: the more positive the charge of an ion is, the smaller the ion is.
–3 > –2 > –1 > 0 > +1 > +2 > +3
Ranking from largest to smallest radius:
As3- > Se2- > Br- > Rb+ > Sr2+
Rank these atoms and ions according to radius.
K- K+ K
Rank these ions according to ionic radius.
Sr2+ As3- Se2- Br- Rb+
Rank these elements according to first ionization energy.
Sb N As P
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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Periodic Trend: Ionic Radius concept. You can view video lessons to learn Periodic Trend: Ionic Radius. Or if you need more Periodic Trend: Ionic Radius practice, you can also practice Periodic Trend: Ionic Radius practice problems.