If an atom has 15 electrons, which will be the outermost shell?

Name: If an atom has 15 electrons, which will be the outermost shell?
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Quizplus · Accepted Answer

The outermost shell of an atom with 15 electrons is the "M" shell, as electrons fill the K, L, and then M shells in order. The K shell can hold up to 2 electrons, the L shell up to 8, and the M shell starts filling next. With 15 electrons, the first 10 fill the K and L shells, and the next 5 go into the M shell.

If an Atom Has 15 Electrons, Which Will Be the Outermost