1.

An element with atomic number 84 and mass number 218 loses one alpha-particle and two beta-particles in three successive stages, the resulting element will have

Answer»

At. No. 84 and mass number 214
At. No. 82 and mass number 214
At. No. 84 and mass number 218
At. No. 82 and mass number 218

Solution :`._(84)A^(218) rarr ._(84)B^(214) + ._(2)He^(4) + 2._(-1)e^(0)`


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