What is the wavelength in nanometers (nm) of a photon that has an energy of 3.0 x 10-19 J ?               (A) 6.6 x 10-7 nm          (B) 150 nm          (C) 660 nm          (D) 1.5 x 106 nm

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.