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Chem Vocab

TermDefinition
Alkaline Earth Metal one of the elements of Group 2 of the periodic table
Period a horizontal row of elements in the periodic table
Subatomic Particles matter smaller than an atom
Compound a substance made up of atoms of two or more different elements joined by chemical bonds
Neutron a subatomic particle that has no charge and that is found in the nucleus of an atom
Reactivity a measure of how readily an element will combine with another element to form a compound
Dalton the scientist who developed the first scientifically based theory of the atom; his theory had five postulates
Nucleus an atom's central region
Diatomic Elements 7 elements that always occur in pairs in nature; HONClBrIF
Bohr the scientist responsible for the Solar System model of the atom: the first person to place electrons into energy levels
Noble Gases unreactive elements of Group 8A of the periodic table
Groups a vertical column of elements in the periodic table that share chemical properties
Rutherford scientist who discovered that the atom is mostly empty space and has a small, dense nucleus
Element a substance that cannot be separated or broken down into simpler substances by chemical means.
Inner Core Electrons electrons that do not participate in chemical reactions
Mass Number the sum of the numbers of protons and neutrons in the nucleus of an atom
Halogens one of the elements of Group 7A of the periodic table
Alkali Metals one of the elements of Group 1 of the periodic table
Isotope an atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons
Oxidation Number equivalent to the charge on an atom or ion
Ion an atom that has gained or lost one or more electrons and has a negative or positive charge
Electron a subatomic particle that has a negative charge
Thomson scientist who discovered the electron and developed the 'Plumb Pudding Model" of the atom
Molar Mass the sum of the atomic masses of all of the elements in a compound
Democritus ancient philosopher who coined the term "atomos"
Polyatomic Ions an ion made of two or more atoms
Atomic Number the number of protons in the nucleus of an atom
Energy Levels where electrons were placed in the solar system model
Atomic Mass the mass of an atom expressed in atomic mass units
Valence outer level of electrons that participate in reactions
Orbitals according to the modern theory, a region in an atom where there is a high probability of finding electrons.
Proton a subatomic particle that has a positive charge and is found in the nucleus of an atom
Atom the smallest unit of an element that maintains the properties of that element
Created by: skhan765