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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

  • science -

    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

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