An isotope of radon is radioactive. It decays by emitting an $\alpha$-particle.
What happens to the nucleus of a radon atom during the emission of the $\alpha$-particle?
1 )
It becomes the nucleus of a different isotope of radon with fewer neutrons.
2 )
It becomes the nucleus of a different isotope of radon with more neutrons.
3 )
It becomes the nucleus of an element with a higher proton number.
It becomes the nucleus of an element with a lower proton number.
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