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When matter has the same composition and properties throughout it is called a substances.

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A proton is a positively charged

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Nonmetals are elements that are usually dull in appearance.

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A neutron would have the same mass as a proton and be electrically neutral.

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A mixture is when two or more substances come together but don't combine to make a new substance.

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The number of protons plus the number of neutrons it contains.

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Atoms of the same element that have different numbers of neutrons.

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A matter made of atoms of only one kind.

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Metalloids are elements that have characteristics of metals and nonmetals.

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Electrons traveling in a region traveling surrounding the nucleus.

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Negatively charged particles.

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Metals generally have a shiny or metallic luster and are good conductors of heat and electricity.

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The top number on the periodic table for an element.

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The weighed average mass of the isotopes of an element.