1.

The atomic number of an elelment X is 19. The number of electrons in its ion X' will be: (a) 18 (b) 19 (c) 20 (d) 21

Answer»

The atomic number of an elelment X is 19. The number of electrons in its ion X' will be:
(a) 18 (b) 19 (c) 20 (d) 21



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