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Sci Chp3

Basic Chem

QuestionAnswer
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 group of atoms that has lost or gained one or more electrons and therefore has a net electric charge 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
Created by: AQ1734 on 2010-10-19



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