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20-08-2021
Chemistry

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Write electronic configuration of first 30 elements in their sub shell

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20-08-2021

Answer:

Helium (He) 1s2

Lithium (Li) [He] 2s1

Beryllium (Be) [He] 2s2

Boron (B) [He] 2s2 2p1

Explanation:

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