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fenix001 [56]
3 years ago
6

Determine the identity of X in the following alpha decay equation (please help)

Chemistry
1 answer:
ICE Princess25 [194]3 years ago
8 0

Answer:

At-207 (meaning At with the number on the top left being 207 and the number at the bottom left being 85.

Explanation:

The sum of the mass numbers has to equal on both sides, so we need 211 = 4+a

a=207

The sum of the atomic numbers as to equal on both sides, so 87=2+b

b=85

The element is determined by the mass number.

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