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2
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A subatomic particle in an atom's nucleus that has a positive charge of 1+.
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4
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States that matter is composed of extremely small particles called atoms.
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5
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The number of protons plus neutrons in an atom.
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7
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Discovered the neutron
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8
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A negatively charged, particle with an extremely small mass has a charge of -1
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10
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this element has an atomic mass of 7.
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12
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Atoms of the same element with different numbers of neutrons.
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13
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Discovered the nuecleus and the proton
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15
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The smallest particle of an element that retains all the properties of that element.
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1
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this element has an atomic number of 2.
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3
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A subatomic particle in an atom's nucleus that has a positive charge of 0.
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4
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The number of protons in an atom.
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5
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a unit of mass, equal to 1/12 the mass of the carbon-12 atom and expresses the mass of atomic and subatomic particles.
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6
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It was his atomic theory
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9
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The extremely small, positively charged, dense center of an atom that contains positively charged protons and neutral neutrons.
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11
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this element has 6 protons and 6 neutrons.
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14
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Discovered the electron.
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