Question

1. label the number of protons, neutrons, and electrons that go into each energy level for the following atom: lithium

Explanation:

Step1: Determine protons in Lithium

Lithium has an atomic number of 3, so protons ($p^+$) = 3.

Step2: Determine neutrons in Lithium

Lithium - 7 is common; mass number = 7. Neutrons ($n$) = mass number - atomic number = 7 - 3 = 4.

Step3: Determine electron energy levels

First energy level (closest to nucleus) holds max 2 electrons. Second energy level holds up to 8, but Lithium has 3 electrons: 2 in first, 1 in second. The outermost (third? Wait, Lithium has 2 energy levels: first (2 e⁻), second (1 e⁻). Wait, the diagram has three energy levels? Wait, maybe a typo, but standard Lithium: atomic number 3, electrons: 2 (n=1), 1 (n=2). So innermost (yellow) energy level: 2 electrons, middle (orange): 1, outermost (purple): 0? Wait, no, Lithium has 2 energy levels. Maybe the diagram has three, but let's go with standard. Protons: 3, neutrons: 4 (for Li - 7), electrons: n=1: 2, n=2: 1, n=3: 0 (but if diagram has three, maybe a mistake, but follow atomic structure).

Answer:

• $p^+ = 3$
• $n = 4$ (for most common isotope Li - 7)
• Innermost energy level (yellow): 2 electrons
• Middle energy level (orange): 1 electron
• Outermost energy level (purple): 0 electrons (or if diagram expects, maybe a different representation, but based on Lithium's electron configuration: 1s² 2s¹, so two energy levels with 2 and 1 electrons)