MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
What is the atomic number of chromium?
Think it through first, then pick an option.
- a 21
- b 22
- c 24
- d 29
Answer and explanation
Correct answer: c 24
Table 3.07: Cr(24) is 2, 8, 13, 1.
Why the other options are wrong
- a 21: 21 is scandium's atomic number; chromium's is 24.
- b 22: 22 is titanium's atomic number; chromium's is 24.
- d 29: 29 is copper, the other exception; chromium's atomic number is 24.
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