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| the center of an atom; made up of protons and neutrons |
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| a positively charged subatomic particle in the nucleus of an atom |
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| a neutral subatomic particle in the nucleus of an atom |
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| a tiny negatively charged subatomic particle moving around outside the nucleus |
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| any of the possible energies an electron may have in an atom |
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| a region in an atom where there is a high probability of finding electrons |
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| an electron in the outermost energy level of an atom |
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| properties of elements tend to change in a regular pattern when elements are arranged in order of increasing atomic number, or number of protons in their atom |
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| a horizontal row of elements in the periodic table |
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Definition
| a vertical column of elements in the periodic table |
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| the process of adding electrons to or removing electons from an atom or group of atoms |
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| an atom of group of atoms that has lost or gained one or more electrons and therefore has a net electric charge |
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Definition
| an icon with a positive charge |
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| an ion with a negative charge |
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Definition
| the number of protons in the nucleus of an atom |
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Definition
| the total number of protons and neutrons in the nucleus of an atom |
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| any atoms having the same number of protons but different number of neutrons |
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| a quantity egaul toe 1/12 of the mass of a carbon-12 atom |
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Definition
| the weighted average of the masses of all naturally occuring isotopes of an element |
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Definition
| the elements that are good conductors of heat and electricity |
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Definition
| the elements that are usually poor conductors of heat and electricity |
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Definition
| the elements that are intermedediate conductors of heat and electricity |
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highly reactive metallic elements (Group 1) |
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reactive metallic elemetns (Group 2) |
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| metallic elements (Group 3-12) |
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| highly reactice elements (Group 17) |
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nonreactive gaseous elements (group 18) |
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| the SI base unit that describes the amount of a substance |
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Definition
| the number of particles in one mol = 6.022x10²³ |
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Definition
| the mass in grams of 1 mol of a substance |
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Definition
| the ratio equals to on that expresses the same quantity in 2 ways |
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