Atom - Unit that composes an element with neutrons, protons, & electrons, Neutron - Neutral particle in the nucleus of an atom, Proton - Positive particle in the nucleus of an atom, Electron - Negative particles that surround the nucleus of an atom, Elements - The specific arrangements of protons, neutrons and electrons in an atom that represent the approximately 110 naturally occurring elements., Sodium - A specific element with 11 electrons, 11 protons and 12 neutrons. It is a metal that when combined with chlorine becomes ordinary table salt., Chlorine - A specific element with 17 electrons, 17 protons and 18 neutrons. It is a nonmetal that can combine with sodium to form salt., salt - A term used to represent elements that combine to form a stable compound with no valence electrons left. (A whole shell is filled), Shells - The outer layer of electrons outside the nucleus that are filled with specific numbers, Stable - A term that describes how reactive an element or compound is., Inert Gases - A group of elements(Group 18), containing no valence electrons in their outer most shells making them stable and unreactive., Metals - The most common type of element where the outermost electrons are less than 4., Nonmetal - The least common type of element where the outermost electrons are more than 4., Valence Electrons - The number of outermost electrons., Periodic Table - An organized table of elements beginning with hydrogen with an atomic number of one that increases by atomic number (number of protons) in succeeding single units of 1 proton., Compound - Two or more elements combined chemically., Properties - Characteristics which accompany an element or compound., Period - Refers to the number of shells in the periodic table.(Horizontal), Groups - These show the same number of valence electrons and thereby the same properties for all elements in that group., Atomic Number - This shows the number of protons in an element., Atomic Mass - The mass number is the mass in grams that an element would have if 6.02 * 10 to the twentysecond power atoms were present. (Mole), Chemical Formula - The arrangement of chemical symbols in specific ratios.,

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