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the time required for half the atoms present in an object have undergone radioactive decay and changed into something else.
hydrogen peroxide (H2O2) will spontaneously react (decompose) to form water and oxygen. One...
the levels of energy in which electrons move and which have fixed amounts of energy.
the simplest type of pure substance that cannot be broken down into simpler components.
electromagnetic waves, similar to X-rays, but with a much shorter wavelength.