Question

1. how many valence electrons does lithium (li) have? answer here 2. how many energy shells does zinc (zn) answer here

Explanation:

• For Lithium (Li), its atomic number is 3. The electron configuration is \(1s^{2}2s^{1}\). Valence electrons are in the outermost shell. Here, the outermost shell (\(n = 2\)) has 1 electron.
• For Zinc (Zn), its atomic number is 30. The electron configuration is \([Ar]3d^{10}4s^{2}\). The principal quantum numbers (\(n\)) represent energy shells. The highest \(n\) value here is 4, so there are 4 energy shells.

Answer:

1. 1
2. 4