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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

Respuesta :

tenny67

Answer:

A)He, Ne, and Ar

Explanation:

I believe its this one. Sorry if its wrong. Remember that 8 electrons are in the outermost energy level .

briannahart04
there are none with seven in the outermost shell, but the ones with eight would be a) He, Ne, and Ar