In ____, a nucleus emits an ____ particle which is a helium-4 nucleus, indicated by 42α. An atom emits a ____ particle (an electron and an electron ____) when a neutron decays into a proton An atom emits a beta-plus particle (a po____) and an electron ____ when a proton decays into a neutron. An excited nucleus relaxes to a ____ energy state via ____ decay. Alpha particles are highly ionizing as they have a double ____, large ____, and because they are relatively ____.

Radioactive decay

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