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April 18, 2015

Homework Help: I don't understand this chemistry problem?

Posted by Amy on Monday, December 3, 2012 at 4:35pm.

The question reads: Place the following elements in order of decreasing atomic size: selenium, chlorine, fluorine, rubidium, calcium, and sulfur.

I looked this up on a periodic table and my answer was: Rb, Se, Ca, Cl, F, S.

This is still marked wrong, and I don't know why.

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