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Which of these elements has an electron configuration of [Kr]5s2? barium calcium rubidium strontium

Karen Wright

in Chemistry

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Theresa Perry on June 17, 2018

Given this electron configuration shorthand, we started from the row in the periodic table that contains Krypton (Kr). Then, since the rest of the electrons are 5s2 (indicating 2 electrons in the orbital 5s), we check the next row (the 5th row) and find the 2nd item, which may contain two electrons. The first element is the rubidium, while the second is strontium, so this means that the Sr is the final answer.


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