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Beta Decay

An element X ...

Question

An element X which has 84 protons and 128 neutrons emits 4a particles and 2b-particles to become element Y. What is atomic number and mass number of Y?

A

78, 195

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B

78, 196

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C

80, 195

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D

80, 196

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Solution

The correct option is B
78, 196

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