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Question
Which of the following has a greater number of electrons than neutrons?
(Mass number of Mg, C, O and Na is 24, 12, 16 and 23 respectively).
Options
Mg2+
C
O2−
Na
MCQ
Solution
O2−
Explanation:
| Species | Mg2+ | C | O2− | Na |
| Number of protons (Z) | 12 | 6 | 8 | 11 |
| Mass number (A) | 24 | 12 | 16 | 23 |
| Number of neutrons (A − Z) | 12 | 6 | 8 | 12 |
| Number of electrons | 10 | 6 | 10 | 11 |
Among the given species, O2− has more electrons than neutrons.
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