Explain highest-energy electrons have the principal quantum

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Reference no: EM13514017

What is the maximum number of electrons in an atom whose highest-energy electrons have the principal quantum number n=5?

the answer is 138 (obviously theortetical). the answer claims that there is a 5g orbital and the 138 is calculate by [Rn] 7s2 5f14 6d10 7p6 5g18

Can anybody explain for me in details?

Reference no: EM13514017

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