Match each atomic number to its element.
1. Which element has the atomic number 17?
- Aluminium
- Barium
- Chlorine
- Oxygen
Atomic number 17 belongs to Chlorine (symbol Cl). An element's atomic number equals the number of protons in its nucleus.
2. Which element has the atomic number 19?
- Oxygen
- Argon
- Manganese
- Potassium
Atomic number 19 belongs to Potassium (symbol K). An element's atomic number equals the number of protons in its nucleus.
3. Which element has the atomic number 20?
- Lithium
- Calcium
- Neon
- Nitrogen
Atomic number 20 belongs to Calcium (symbol Ca). An element's atomic number equals the number of protons in its nucleus.
4. Which element has the atomic number 26?
- Bromine
- Silver
- Copper
- Iron
Atomic number 26 belongs to Iron (symbol Fe). An element's atomic number equals the number of protons in its nucleus.
5. Which element has the atomic number 29?
- Cobalt
- Oxygen
- Platinum
- Copper
Atomic number 29 belongs to Copper (symbol Cu). An element's atomic number equals the number of protons in its nucleus.
6. Which element has the atomic number 30?
- Zinc
- Barium
- Iron
- Lithium
Atomic number 30 belongs to Zinc (symbol Zn). An element's atomic number equals the number of protons in its nucleus.
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