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Question
How do atoms attain noble gas configuration?
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Solution
Atoms lose, gain or share electrons to attain noble gas configuration.
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Five atoms are labelled from A to E.
| Atoms | Mass No. | Atomic No. |
| A | 40 | 20 |
| B | 19 | 9 |
| C | 7 | 3 |
| D | 16 | 8 |
| E | 14 | 7 |
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(i) contains 7 protons,
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\[\ce{^40_20Ca}\]
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