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(image, in chemistry, a mixture is a material made up of two or more…
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A pure substance or chemical substance is a material that has a constant composition (is homogeneous) and has consistent properties throughout the sample.
in chemistry, a mixture is a material made up of two or more different substances which are physically combined.
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An atom is the smallest unit of matter that has the properties of an element. It is composed of a dense core called the nucleus and a series of outer shells occupied by orbiting electrons.
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In chemistry, an element is a pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei.
The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment.
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Mass is both a property of a physical body and a measure of its resistance to acceleration when a net force is applied.
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A proton is a subatomic particle, symbol p or p⁺ , with a positive electric charge of +1e elementary charge and a mass slightly less than that of a neutron.
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The neutron is a subatomic particle, symbol n or n⁰ , with no electric charge and a mass slightly greater than that of a proton. Protons and neutrons constitute the nuclei of atoms.
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The electron is a subatomic particle, symbol e⁻ or β⁻ , whose electric charge is negative one elementary charge.
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