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Elements and Compounds

What is the total number of electrons in the second principal energy level of a calcium atom in the ground state?

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November 25, 2008 2:59PM

The electron configuration of calcium is: 1s2 2s2 2p6 3s2 3p6 4s2 The "second principle energy level" refers in this case to the 2s and 2p orbitals, so it would be a total of 8 electrons.