I don't understand this chemistry problem?

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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.

  • I don't understand this chemistry problem? -

    Size increases top to bottom and decreases left to right. Therefore, Rb is the largest and F is the smallest.
    I would do this as
    Rb, Ca, Se, S, Cl, F.

  • I don't understand this chemistry problem? -

    dfadf

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