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ss7ja [257]
3 years ago
5

A certain radioactive atom has 90 protons and 142 neutrons. If this atom undergoes alpha decay, what is the mass number of the d

aughter atom? The mass number of the daughter atom is .
Chemistry
1 answer:
Anastaziya [24]3 years ago
7 0

Answer:

228

Explanation:

alpha decay is removing alpha particle _2^{4}He

2 number of protons, 4 mass number = 2 protons + 2 neutrons

We have

      90 protons and 142 neutrons

<u>       - 2 protons         -  2 neutrons</u>

      88 protons         140 neutrons

Mass number of new (daughter) atom = 88 +140 = 228

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