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  4. An orbital electron in the ground state of hydrogen has an angular momentum L1, and an orbital electron in the first orbit in the ground state of lithium (double ionised positively) has an angular momentum L2. Then :

Q. An orbital electron in the ground state of hydrogen has an angular momentum , and an orbital electron in the first orbit in the ground state of lithium (double ionised positively) has an angular momentum . Then :

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Solution:

Doubly ionised positively lithium ion is a hydrogen like atom so we use

Also for both we have

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