Dalaina Johnson, Chemistry CP, Per 5

2 protons and 2 neutrons emitted from the nucleus 

an electron emitted from the nucleus 

very havey two parts or more

low mass nuclei combine to form a heavier 

are high enegry electromagnetic waves emitted 

the time required for half the atoms of a radioactive 

has the same mass as an electron but has a positive charge 

different masses nuclei are unstable