1. Explain half-life

The time taken for an unstable radioactive nuclide to decay to half its original number is called the half-life.

The symbol for half-life is T1/2

2.Determine half-life from a decay curve

The decay graph is a graph of the number of atom/ reactivity/ mass against time.

The number of number of atom/ reactivity/ mass of radioactive sample decreases exponentially with time.

The half-life of the same radioactive element or nuclide is the same.

Different nuclides have different decay rates, thus different nuclides have different half-life.

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