Elements | A | B | C | D | E |
Mass number | 1 | 7 | 14 | 40 | 40 |
Atomic number | 1 | 3 | 7 | 18 | 20 |
Answer:
(a) Number of neutrons in 5 = 7 ? 3 = 4
Numbers of neutrons in D = 40 -18 = 22.
(b) Electronic configuration of the element B is 2, 1. Therefore, its valency
is 1.
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