Is atomic number of scandium is greater than calcium?
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With scandium and the transition metals, 3d electrons are involved as well. Zinc's 3d electrons aren't involved because the 3d level is then full. Calcium's density is quite low at 1.54 g cm-3. ... The radius of a calcium atom is 0.197 nm; the radius of an iron atom is only 0.126 nm.
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