Atomic, covalent, ionic radii

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remymink4J
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

Atomic, covalent, ionic radii

Postby remymink4J » Wed Oct 14, 2015 5:28 pm

What is the difference between atomic, covalent, and ionic radii? What importance do they have in periodic trends?

KaylaH
Posts: 26
Joined: Fri Sep 25, 2015 3:00 am

Re: Atomic, covalent, ionic radii

Postby KaylaH » Thu Oct 15, 2015 1:24 pm

So if we first define an atomic radius as half the distance between the center of neighboring atoms, then a the definition of a covalent radius is the same except that the two atoms are joined by a covalent bond. The same goes for an ionic radius, except it applies to two ions joined by an ionic bond.

The trend in the periodic table is that atomic radii increase down a group because additional shells are father away from the nucleus, thus increasing the size and radius of the atom. Atomic radii also decrease across a period because electrons are added to the same shell and the increasing nuclear charge draws them in.

Atomic radii show an inverse relationship with ionization energy because ionization energy decreases down a group, and increases across period.


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