Tritium, a radioactive element on decay forms an isotope of an inert gas and emits a beta particle. The inert gas is
A
Helium
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B
Argon
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C
Neon
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Solution
The correct option is A Helium Tritium's nucleus consists of 2 neutrons and 1 proton. Due to its radioactive nature, it emits a beta particle which changes one of neutrons in tritium to a proton.
As a result an isotope of helium with atomic mass '3' is produced.