1. Which element has the atomic number 1?
- AChromium
- BHydrogen
- CSodium
- DAluminium
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Answer: B
Hydrogen has atomic number 1, making it the lightest and first element in the Periodic Table.
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Periodic Table - Atomic Numbers — Chemistry Questions & Practice
Practise 72 Periodic Table - Atomic Numbers questions from Chemistry for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.
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Practice questions on Periodic Table - Atomic Numbers — with answers
Try each question first, then open the answer. Explanations are included.
2. Which element has the atomic number 8?
- AGold
- BNeon
- CMercury
- DOxygen
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Answer: D
Oxygen has atomic number 8, meaning it has 8 protons in its nucleus.
3. What is the atomic number of Helium?
- A50
- B6
- C2
- D47
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Answer: C
The atomic number of Helium is 2.
4. Which element has the atomic number 2?
- AIodine
- BZinc
- CManganese
- DHelium
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Answer: D
The atomic number of Helium is 2.
5. Which element has the atomic number 3?
- ACarbon
- BZinc
- CLithium
- DNeon
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Answer: C
The atomic number of Lithium is 3.
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