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Alkali Metals

what is the e...

Question

what is the electronic configuration of 57

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Solution

The atomic number 57 is Lanthanum.
Its electronic configuration is

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²5d¹

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