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Question

The beta particles of a radioactive metal originate from 
  1. the nucleus of atom.
  2. the free electrons in the metal.
  3. energetic bound electrons of atom.
  4. the photons released from the nucleus.


Solution

The correct option is A the nucleus of atom.
The beta particle β, which may be either negatively charged (negatrons) or positively charged (positrons), originates from the nucleus of an atom.
A beta particle is emitted from the nucleus of an atom during radioactive decay.

np+e1 (β particle)+¯v
Beta decay occurs in isotopes which are neutron rich - have a lot more neutrons in their nucleus than  protons.

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