Let’s work through this step by step.
We are given a table (Table 2) that shows elements and how many electrons they have in each energy level (Level 1, Level 2, Level 3). We need to fill in the missing numbers for Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, and Neon.
We also know from Table 1 (which we can’t see but is referenced) that:
- The
group number tells us how many valence electrons (electrons in the outermost shell) an element has — for main group elements.
- The
period number tells us how many energy levels (shells) are being used.
Also, remember:
- Electrons fill shells in order: Level 1 holds max 2, Level 2 holds max 8, Level 3 holds up to 8 for these early elements.
- Total electrons = atomic number (for neutral atoms).
Let’s go element by element using their atomic numbers (from periodic table knowledge):
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Lithium (Li) – Atomic number 3
→ 3 total electrons
→ Fill Level 1 first: 2 electrons
→ Remaining: 1 → goes to Level 2
→ So: Level 1 = 2, Level 2 = 1, Level 3 = 0
Beryllium (Be) – Atomic number 4
→ 4 total electrons
→ Level 1: 2
→ Level 2: 2
→ Level 3: 0
Boron (B) – Atomic number 5
→ Level 1: 2
→ Level 2: 3
→ Level 3: 0
Carbon (C) – Atomic number 6
→ Level 1: 2
→ Level 2: 4
→ Level 3: 0
Nitrogen (N) – Atomic number 7
→ Level 1: 2
→ Level 2: 5
→ Level 3: 0
Oxygen (O) – Atomic number 8
→ Level 1: 2
→ Level 2: 6
→ Level 3: 0
Fluorine (F) – Atomic number 9
→ Level 1: 2
→ Level 2: 7
→ Level 3: 0
Neon (Ne) – Atomic number 10
→ Level 1: 2
→ Level 2: 8
→ Level 3: 0
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Now let’s fill Table 2:
| Element | Level 1 | Level 2 | Level 3 |
|-------------|---------|---------|---------|
| Hydrogen | 1 | 0 | 0 |
| Helium | 2 | 0 | 0 |
| Lithium | 2 | 1 | 0 |
| Beryllium | 2 | 2 | 0 |
| Boron | 2 | 3 | 0 |
| Carbon | 2 | 4 | 0 |
| Nitrogen | 2 | 5 | 0 |
| Oxygen | 2 | 6 | 0 |
| Fluorine | 2 | 7 | 0 |
| Neon | 2 | 8 | 0 |
✔ All values check out with electron configuration rules.
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Final Answer:
Table 2 filled as follows:
Lithium: Level 1 = 2, Level 2 = 1, Level 3 = 0
Beryllium: Level 1 = 2, Level 2 = 2, Level 3 = 0
Boron: Level 1 = 2, Level 2 = 3, Level 3 = 0
Carbon: Level 1 = 2, Level 2 = 4, Level 3 = 0
Nitrogen: Level 1 = 2, Level 2 = 5, Level 3 = 0
Oxygen: Level 1 = 2, Level 2 = 6, Level 3 = 0
Fluorine: Level 1 = 2, Level 2 = 7, Level 3 = 0
Neon: Level 1 = 2, Level 2 = 8, Level 3 = 0
Parent Tip: Review the logic above to help your child master the concept of properties of atoms and the periodic table worksheet answers.
