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| Q.19 | Which of the following sets of elements is arranged in descending/decreasing order of atomic mass? | |
| Ans | 1. Sulphur, magnesium, sodium, calcium | |
| 2. Magnesium, sodium, calcium, sulphur | ||
| 3. Sodium, calcium, sulphur, magnesium | ||
| 4. Calcium, sulphur, magnesium, sodium |
Correct Ans Provided: 4
