Which of the following elements are non-metals (there may be more than one correct answer; select all that are correct)?   Answer choices:  A. Hydrogen B. Boron C. Gallium D. Chlorine E. Calcium

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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.