Chemistry
The question refers to the elements of the periodic table with atomic numbers from 3 to 18. In the table below, the elements are shown by letters which are not indicative of the usual symbols of the elements.
| At. No. | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Element | A | B | C | D | E | F | G | H |
| At. No. | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| Element | I | J | K | L | M | N | O | P |
Which of these is :
- a noble gas ?
- a halogen ?
- an element with valency 4 ?
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