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Question
An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is
Options
17
11
18
20
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Solution
An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is 17.
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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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\[\ce{^39_19K}\]
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| 3. | Ionic bond | c. | Water |
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