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[Kr] 5s(1)

or, in the longer version


1s(2) 2s(2) 2p(6) 3s(2) 3p(6) 4s(2) 3d(10) 4p(6) 5s(1)


Note: All the numbers in the parentheses are supposed to be in superscript (not sure how to do it) and they represent the number of electrons in the sublevel. The first configuration uses the noble gas Krypton (basically an abbreviated form of electron configuration). Both configurations are according to the Aufbau principle (lower energy levels are filled in first). So, if you're confused when you see, for example, 4s before 3d, this is just according to the principle.

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14y ago
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10y ago

The electron configuration of rubidium is: [Kr]5s1.

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Q: How do you write the shorthand electron configuration for rubidium?
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