The correct set of quantum numbers (n,l,m) for unpaired electrons in lithium atom is:

Explanation

In a lithium (Li) atom, there are three electrons. To determine the correct set of quantum numbers for the unpaired electrons, we first need to consider the electronic configuration. The electronic configuration of lithium is 1s² 2s¹. The quantum number "n" (the principal quantum number) for all three electrons is 2 (since they are in the second energy level).The quantum number "l" (the azimuthal quantum number) for the 2s orbital is 0.The quantum number "m" (the magnetic quantum number) for the 2s orbital can be either -1 or 0 or 1 (as there is one unpaired electron in the 2s orbital).So, the correct set of quantum numbers for the unpaired electrons in a lithium atom is: n = 2 (for all electrons), l = 0 (for the 2s electron), m = 0 (for the 2s electron)