Chemistry, 18.11.2020 20:30, twentyonepilots12018

Please help Which of the following lists contains elements with seven electrons in their outermost energy levels?

He, Ne, and Ar

Cr, Mn, and Fe

Br, I, and Cl

O, S, and Se

Answers: 2

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Please help Which of the following lists contains elements with seven electrons in their outermost...