MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
Which has the lower ionization energy?
Think it through first, then pick an option.
- a Mg
- b Ra
- c Ca
- d Ba
Answer and explanation
Correct answer: b Ra
Ra is lowest in group 2, the largest, so the lowest.
Why the other options are wrong
- a Mg: Mg is high in group 2, higher. The answer is Ra.
- c Ca: Ca is above Ra. The answer is Ra: Ra is lowest in group 2, the largest, so the lowest.
- d Ba: Ba is above Ra. The answer is Ra: Ra is lowest in group 2, the largest, so the lowest.
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