Physics atoms
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| the attraction between protons abd electrons can cause atoms to combine | Bonding
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| electrical neutral | neutron
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| second lightest element | helium
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| atoms are much older than the material the compose. True or False? | true
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| the most common type of molecule | H20
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| in 1827 he studied pollen grains under a microscope. who is he? | Robert brown
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| smallest particle of a substance is a | molecule
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| this man said matter was made of atoms. | John Dalton
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| the evidence that atoms exist is called | Brownian motion
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| the 5 elements that make up living things: | oxygen, carbon, hydrogen, nitrogen, calcium
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| atoms of the same element having different numbers of neutrons are | isotopes
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| the number of protons in the nucleus is called | the atomic number
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| the toal number of nucleons in the nucleus of an atom | atomic mass unit
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| electrons have______ | mass
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| the arrangement in of _______ in the shells dictate the atom's physical and chemical properties | electrons
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| central region of an atom | nucleus
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| atoms move fastest in | gas
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| like charges | repel
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| building blocks of matter | an atom
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| atoms are the smallest particles of an | element
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| a substance made of only 1 kind of atom is a | element
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| forms when electrons are transfered between atoms | Ionic bonds
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| the lightest element is | hydrogen
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| some atoms are old as | the universe
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| a substance that is made of atoms of different elements in a fixed proportion is a/an | compound
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| water and carbon dioxide are made of | molecules
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| atoms are mostly empty space. true or false? | true
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| the nucleus contains most of the ____ of an atom | mass
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| forms when two atoms share electrons | covalent bonds
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| electrons orbit the | nucleus
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| unlike charges | attract
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