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Science Vocabulary #11

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Across
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Anything that has mass and takes up space.
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The smallest particle of a compound.
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The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
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The smallest particle of an element that has the properties of that element.
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The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
Down
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Total number or protons and neutrons in an atom’s nucleus.
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A Particle that has no electric charge and is located in an atom’s nucleus.
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A pure substance that cannot be broken down into a simpler substance by ordinary chemical changes; an element consisting of one type of atom.
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A substance that is formed when two or more different elements combine chemically.
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A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge.