The electron is transferred from the 2s orbital in a lithium atom to make a positive ion (Li+).

Here's why:

* Lithium's electron configuration: Lithium has an electron configuration of 1s²2s¹. This means it has 3 electrons: two in the 1s orbital and one in the 2s orbital.

* Valence electron: The outermost electron (in the 2s orbital) is the valence electron, and it's the one most easily removed.

* Ionization: When lithium loses its valence electron, it becomes a positively charged ion (Li+) with a stable electron configuration like helium (1s²).

Therefore, the electron transferred from the lithium atom to form the Li+ ion comes from the 2s orbital.