MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
What is the relative atomic mass of 'F'?
Think it through first, then pick an option.
- a 9
- b 11
- c 17
- d 19
Answer and explanation
Correct answer: d 19
F: 3.16 × 10⁻²³ ÷ 1.66 × 10⁻²⁴ ≈ 19.
Why the other options are wrong
- a 9: 9 is fluorine's atomic number; its relative atomic mass is 19.
- b 11: 11 does not fit; F gives 3.16 × 10⁻²³ ÷ 1.66 × 10⁻²⁴ ≈ 19.
- c 17: 17 is chlorine's atomic number; fluorine's relative atomic mass is 19.
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