Question

Write the electron configuration of Kr.

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Recall how to write the electron configuration to answer this question.

According to the Aufbau principle, known as the building-up principle, electrons occupy orbitals in increasing energy order. The occupations are listed in the following order:

1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s<4f<5d<6p  etc.\small{1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s<4f<5d<6p~~\text{etc}.}

The maximum number of electrons in the s orbital is 2, in p orbital 6, in d orbital 10, and in the f orbital 14 electrons.

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