Question

radioactive nucleus undergoes a series of decays according to the sequence below If the mass number and atomic number of X3 are 172 and 69 respectively, what is the mass number and atomic number of X?
plz I need this answer immediately
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Answer 1

Answer:

The correct radioactive decay sequence will be as follows:

72

X

180

β

73

X

1

180

α

71

X

2

176

α

69

X

3

172

Mass number of X=180

Atomic number of X=72