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atoms of the same element that contain equal numbers of protons (same atomic number) but different numbers of neutrons in their nuclei.
the separation of a dye into the different colours that make up that dye, as a result of the...
large deposits formed from the excrement and bodies of seabirds. Often found on islands.
the isotope of hydrogen that contains two neutrons.
the time required for half the atoms present in an object have undergone radioactive decay and...
a reaction that takes place automatically by itself, without requiring extra stimulation.