When a beta particle is released from the nucleus of an atom:

the number of electrons in the atom decreases by one

the number of electrons in the atom increases by one as the beta particle leaves the nucleus and joins the valence electrons

the mass number of the atom remains the same

the mass number of the atom decreases

Question

When a beta particle is released from the nucleus of an atom:
		
the number of electrons in the atom decreases by one
		
the number of electrons in the atom increases by one as the beta particle leaves the nucleus and joins the valence electrons
		
the mass number of the atom remains the same
		
the mass number of the atom decreases

welshfella · Answer

Hint:   a beta particle is an electron.

nvidiaintely · Answer

hmmm...

kevin · Answer

That's the answer.. lol

nvidiaintely · Answer

Its A!

kevin · Answer

yeah

welshfella · Answer

That is one  answer  There is another.

welshfella · Answer

In the nucleus one neutron becomes a proton  so how does that affect the mass number?

welshfella · Answer

Remember the mass number = number of protons + number of neutrons.

welshfella · Answer

So the mass number remains the same.