Question

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

Answer 1

mass/atomic X ->
mass-4/atomic-2 Y + 4/2 He

mass-4/atomic-2 Y ->
mass-4/atomic+1 Y + 0/-1e +0/-1e + 0/-1e

mass-4/atomic+1 Y ->
mass-4/atomic Y + 0/+1e