MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
Look at these statements:
- i. Zn has 2 electrons in its N shell
- ii. Ca has 8 electrons in its M shell
- iii. Ni has 8 valence electrons
Think it through first, then pick an option.
- a i and ii
- b i and iii
- c ii and iii
- d i, ii and iii
Answer and explanation
Correct answer: a i and ii
i is true: Zn is 2, 8, 18, 2. ii is true: Ca is 2, 8, 8, 2, with 8 in M. iii is false: Ni is 2, 8, 16, 2, so 2 in the last shell.
Why the other options are wrong
- b i and iii: iii is false: Ni has 2 in its last shell, not 8; and ii, which is true, is left out.
- c ii and iii: i is true but left out, and iii is false: Ni is 2, 8, 16, 2.
- d i, ii and iii: iii is false: Ni is 2, 8, 16, 2, with 16 in M and 2 in its last shell, N, not 8.
More board questions on this topic
- How many subshells are there in the N shell of an atom?
- At most how many electrons can the 'K' level hold?
- At most how many electrons can the "M" level hold?
- What is the maximum electron capacity of the 'N' level?
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