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Tin-126 undergoes electron capture. What will be the mass number of the product of this decay?

A. 126
B. 124
C. 125
D. 127

Answer :

When tin-126 undergoes electron capture, it involves the process where an electron is captured by the nucleus. This results in the conversion of a proton into a neutron.

Key points to remember:
1. Electron Capture: This process decreases the atomic number by 1 because one proton is converted into a neutron, but it does not affect the mass number.
2. Mass Number: The mass number is the total number of protons and neutrons in an atom. Since a neutron and a proton have almost the same mass, the mass number remains unchanged during electron capture.

So, for tin-126:
- Initial Mass Number: 126
- Final Mass Number: 126

Therefore, the mass number of the product of this decay is 126.

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