science
posted by Jan .
An element emits one alpha particle, one positron, and three beta particles. Its atomic number....
decreases by 2
decreases by 1
stays the same
increases by 1
increases by 2

mass/atomic X >
mass4/atomic2 Y + 4/2 He
mass4/atomic2 Y >
mass4/atomic+1 Y + 0/1e +0/1e + 0/1e
mass4/atomic+1 Y >
mass4/atomic Y + 0/+1e