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Definition of "atom" |
A particle which is the smallest unit of a chemical element. It is made up mainly of electrons (minus charges) in orbit around protons (positive charges). / A particle of matter which cannot be broken up by chemical means. Atoms have a nucleus consisting of positively charged protons and uncharged neutrons of the same mass. The positive charges on the protons are balanced by a number of negatively charged electrons in motion around the nucleus. / (1) a particle of matter indivisible by chemical means, which is chemically neutral.It is the fundamental building block of the chemical elements. |
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