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Which element has 6 energy levels and 7 valence electrons?

Astatine (At)

Polonium (Po)

Seaborgium (Sg)

Rhenium (Re)

2 answers

my answer is D.

level 6 is from Cs to Rn
7 outer shell electrons is in the column under F and Cl (Halogens)
That is At

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