The atomic numbers of three elements A, B and C are given below :
The atomic numbers of three elements A, B and C are given below :
| Element | Atomic number |
| A | 5 |
| B | 7 |
| C | 10 |
(i) Which element belongs to group 18 ? (ii) Which element belongs to group 15 ?
(iii) Which element belongs to group 13 ? (iv) To which period/periods do these elements belong ?
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(i) C (2, 8).
(ii) B (2, 5).
(iii) A (2, 3).
(iv) 2nd period (2 shells are filled).
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