Periodic Table Facts worksheet for learning element symbols, atomic numbers, and classifications.

Here is the complete solution to all sections of the worksheet “Periodic Table Facts,” with explanations for each part.

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## Part 1: Identify the symbol for each element

This section tests your knowledge of elemental symbols. Most are one or two letters, often derived from the English name (e.g., Oxygen → O), but some come from Latin or other languages (e.g., Iron → Fe from *Ferrum*).

✔ Answers:

| # | Element | Symbol |
|----|-------------|--------|
| 1 | Oxygen | O |
| 2 | Hydrogen | H |
| 3 | Chlorine | Cl |
| 4 | Sodium | Na *(from Latin "Natrium")* |
| 5 | Fluorine | F |
| 6 | Carbon | C |
| 7 | Helium | He |
| 8 | Nitrogen | N |
| 9 | Copper | Cu *(from Latin "Cuprum")* |
| 10 | Sulfur | S |
| 11 | Magnesium | Mg |
| 12 | Manganese | Mn |
| 13 | Neon | Ne |
| 14 | Bromine | Br |
| 15 | Phosphorus | P |
| 16 | Silver | Ag *(from Latin "Argentum")* |
| 17 | Lead | Pb *(from Latin "Plumbum")* |
| 18 | Iron | Fe *(from Latin "Ferrum")* |
| 19 | Calcium | Ca |
| 20 | Potassium | K *(from Latin "Kalium")* |

> 💡 Tip: Memorize common exceptions like Na, K, Fe, Cu, Ag, Pb — they’re frequently tested!

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## Part 2: Fill in the chart below

You’re given partial information and must fill in the missing pieces using the periodic table.

Example row:

- Sodium: Symbol = Na, Atomic Number = 11, Period = 3, Group = 1 ✔

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Row 1: Symbol = O

- Element: Oxygen
- Atomic Number: 8
- Period: 2 (row 2 on periodic table)
- Group: 16 (also called the Chalcogens)

> 📌 Oxygen is in period 2, group 16.

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Row 2: Element = Krypton

- Symbol: Kr
- Atomic Number: 36
- Period: 4
- Group: 18 (Noble gases)

> 📌 Krypton is a noble gas in period 4.

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Row 3: Atomic Number = 79

- Element: Gold (Au)
- Symbol: Au
- Period: 6
- Group: 11

> 📌 Atomic number 79 = Gold (Au), found in period 6, group 11.

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Row 4: Period = 4, Group = 7

- Element: Manganese (Mn)
- Symbol: Mn
- Atomic Number: 25

> 📌 Group 7 in period 4 is Manganese (Mn). (Note: In modern IUPAC notation, group 7 includes Mn, Tc, Re, Bh.)

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✔ Completed Chart:

| Element | Symbol | Atomic Number | Period | Group |
|------------|--------|---------------|--------|-------|
| Sodium | Na | 11 | 3 | 1 |
| Oxygen | O | 8 | 2 | 16|
| Krypton| Kr | 36 | 4 | 18|
| Gold | Au | 79 | 6 | 11|
| Manganese| Mn| 25 | 4 | 7 |

*(Note: The last row was blank except for Period=4 and Group=7 — we filled it with Manganese.)*

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## Part 3: Give an atom with the following characteristics

This tests your understanding of periodic table groups/families.

✔ Answers (with explanations):

a) Halogen → Cl (Chlorine)
> Halogens are Group 17: F, Cl, Br, I, At, Ts. Any one works. Cl is common.

b) Chalcogen → O (Oxygen)
> Chalcogens are Group 16: O, S, Se, Te, Po, Lv.

c) Alkali metal → Na (Sodium)
> Alkali metals are Group 1: Li, Na, K, Rb, Cs, Fr.

d) Actinide series → U (Uranium)
> Actinides are elements 89–103. Uranium (92) is most well-known.

e) Lanthanide series → Ce (Cerium) or Eu (Europium)
> Lanthanides are elements 58–71. Cerium (58) is first; Europium is also common.

f) Alkaline Earth metal → Mg (Magnesium)
> Group 2: Be, Mg, Ca, Sr, Ba, Ra.

g) Transition metal → Fe (Iron)
> Transition metals are Groups 3–12. Iron (Fe) is classic example.

h) Nobel gas → Ne (Neon)
> Noble gases are Group 18: He, Ne, Ar, Kr, Xe, Rn, Og.

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## ✔ Final Answer Summary:

Part 1: Symbols

1. O 2. H 3. Cl 4. Na 5. F 6. C 7. He 8. N 9. Cu 10. S
11. Mg 12. Mn 13. Ne 14. Br 15. P 16. Ag 17. Pb 18. Fe 19. Ca 20. K

Part 2: Chart

| Element | Symbol | Atomic Number | Period | Group |
|------------|--------|---------------|--------|-------|
| Sodium | Na | 11 | 3 | 1 |
| Oxygen | O | 8 | 2 | 16 |
| Krypton | Kr | 36 | 4 | 18 |
| Gold | Au | 79 | 6 | 11 |
| Manganese | Mn | 25 | 4 | 7 |

Part 3: Examples

a) Cl b) O c) Na d) U e) Ce f) Mg g) Fe h) Ne

*(All answers are correct as long as they match the category. Alternative valid answers exist — e.g., for halogen you could write Br or I.)*

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Let me know if you’d like a printable version or flashcards for memorizing symbols! 🧪📚