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In a radioactive decay, an emitted electron comes from

1. The nucleus of atom
2. The orbit with principal quantum number 1
3. The inner orbital of the atom
4. The outermost orbit of the atom

Correct answer: The nucleus of atom

Solution

In beta decay, an electron is emitted from the nucleus when a neutron converts into a proton and an electron. This electron is not from the atomic orbitals but is produced within the nucleus.

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