Lithium
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hydrogen
An electron is transferred from the 2s orbital of lithium to form a Li ion. This results in the formation of a Li+ ion with a filled 1s and empty 2s orbital.
Zero.
The electron configuration for the beryllium ion (Be^2+) is 1s^2 2s^2. Beryllium typically has an electron configuration of 1s^2 2s^2, but when it loses two electrons to become the Be^2+ ion, it loses the two outermost 2s electrons.
lithium atom is just a ball it has 1s and 2s orbitals both of which are spheres the 1s is occupied by two electrons and the 2s one electron