Enter the symbol for the element being described. Enter only the elemental symbol, not the name. Note: If there is more than one

Question

Enter the symbol for the element being described. Enter only the elemental symbol, not the name. Note: If there is more than one possible correct answer, full credit will be given for any you choose.
Element with 4 valence electrons in the 5th energy level:

Kunduz · Accepted Answer

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