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Sci Chp3
Basic Chem
| Question | Answer |
|---|---|
| the highly reactive metallic elements located in Group 1 of the periodic table | alkali metals |
| the reactive metallic elements located in Group 2 of the periodic table | alkaline-earth metals |
| an ion with a negative charge | anion |
| a quantity equal to one-twelfth the mass of a carbon-12 atom | atomic mass unit (amu) |
| the number of protons in the nucleus of an atom | atomic number |
| the weighted average of the masses of all naturally occurring isotopes of an element | average atomic mass |
| the number of particles in 1 mol; equals 6.022 3 × 1023/mol | Avogadro’s constant |
| an ion with a positive charge | cation |
| a ratio equal to one that expresses the same quantity in two different ways | conversion factor |
| a tiny negatively charged subatomic particle moving around outside the nucleus of an atom | electron |
| any of the possible energies an electron may have in an atom | energy level |
| a vertical column of elements in the periodic table; also called a family | group |
| the highly reactive elements located in Group 17 of the periodic table | halogens |
| an atom or molecule with a net electric charge due to the loss or gain of one or more electrons | ion |
| the process of adding electrons to or removing electrons from an atom or group of atoms | ionization |
| any atoms having the same number of protons but different numbers of neutrons | isotopes |
| the total number of protons and neutrons in the nucleus of an atom | mass number |
| the elements that are good conductors of heat and electricity | metals |
| the mass in grams of 1 mol of a substance | molar mass |
| the SI base unit that describes the amount of a substance | mole |
| a neutral subatomic particle in the nucleus of an atom | neutron |
| the unreactive gaseous elements located in Group 18 of the periodic table | noble gases |
| the elements that are usually poor conductors of heat and electricity | nonmetals |
| the center of an atom; made up of protons and neutrons | nucleus |
| a region in an atom where there is a high probability of finding electrons | orbital |
| a horizontal row of elements in the periodic table | period |
| the properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number | periodic law |
| a positively charged subatomic particle in the nucleus of an atom | proton |
| the elements that are intermediate conductors of heat and electricity | semiconductors |
| the metallic elements located in Groups 3–12 of the periodic table | transition metals |
| an electron in the outermost energy level of an atom | valence electron |