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    An element is defined by the number of protons in an atom’s nucleus.

    The earliest-known hominids in East Africa are often found in very specific stratigraphic contexts that have implications for their relative dating.This produces radiation and is particularly prominent with larger atoms that are easily able to fall apart spontaneously, leading to new elements or a lighter form of the original element.The time it takes for half of the atoms of an element in a sample to decay is known has its half-life.This also works with stone tools which are found abundantly at different sites and across long periods of time.Stratigraphic dating is based on the principle of depositional superposition of layers of sediments called strata.

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