Atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas and plasma composed of natural or ionised atoms. Atoms are extremely small, typically around 100 picometers across. That is one times ten to the minus eight kilogramme. (1e-8).
An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.
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Atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas and plasma composed of natural or ionised atoms. Atoms are extremely small, typically around 100 picometers across. That is one times ten to the minus eight kilogramme. (1e-8).
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An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.