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Group Displacement Law

How many α ...

Question

How many $α - p a r t i c l e s$ will be emitted when $_{90} T h^{234} c h a n g e s i n t o_{84} P o^{218}$ ?

A

1

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B

2

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C

3

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D

4

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Solution

The correct option is D 4
$_{90} T h^{234} \to_{84} P o^{218} +_{x_{2}} H e^{4}$
Equating atomic number on both sides
234 = 218 + 4x or 4x = 234 - 218
$∴$ x = 4

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