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| anything that occupies space and has mass |
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| the combination of two or more substances |
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| a material that has a definite and constant composition |
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| the smallest particle of an element that has the same chemical properties of that element |
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| Named the nucleus and created the nuclear model |
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| Laid the groundwork for the periodic table |
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| A positively charged subatomic particle within the nucleus of an atom |
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| A subatomic particle, found in an atom's nucleus, containing no charge |
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| Negatively charged subatomic particle, located in the orbits, of an atom |
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| "center-seeking" force that prevents electrons from flying out of their orbits |
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| the process of adding or removing an electron from an atom |
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| The number of electrons in the outermost shell never exceeds 8 electrons |
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Atoms that have the same number of protons in the nucleus but differ in the number of neutrons.
Same Z#, different A#. |
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| Atoms that have the same number of neutrons but different number of protons. |
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| Atoms that have the same numbers of protons and neutrons but a different nuclear energy state. |
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| Vertical columns on periodic table that have the same number of electrons in the outermost shell and therefore have similar chemical properties. |
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| Horizontal rows on the periodic table that contain elements with the same number of electron shells. |
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| Group 1 - soft metals that combine readily with oxygen and react violently with water; excludes hydrogen. |
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| Group 7 - Easily vaporized and combine with metals to form water-soliuble salts. |
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| Group 8 - In octet configuration and are highly resistant to reaction with other elements. |
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| Believed that all matter was composed of 4 substances: earth, water, air and fire. |
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| Visualized that atoms combined with other atoms through an eye-and-hook affair. |
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| Arranged the first periodic table. |
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| Described the atom as looking somethine like plum pudding. |
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| Introduced the nuclear model and described/named the nucleus. |
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| Created the solar system model of the atom. |
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| Protons & neutrons; contained in the nucleus. |
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| The strength of the attachment of an electron to the nucleus |
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| smallest particle of a compound |
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| when atoms share electrons |
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| positive terminal of the x-ray tube |
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