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above the mesopause, at a height of 130 km.
the area of chemistry that deals with the relative quantities of reactants and products in...
the time required for half the atoms present in an object have undergone radioactive decay and...
a measure of the ability of an atom to attract electrons to itself; measure of the tendency...
the introduction of halogen atoms into a compound by addition or substitution.
when radioactive particles collide with air molecules, they can cause the molecules to lose or...