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Periodic Table the chart scientists use to organize and classify all the known elements
Element a pure substance that cannot be broken down into simpler substances by chemical reactions
Element Symbol a symbol that represents the element, usually one or two letters
Atomic Number the number of protons in the nucleus of an atom; atomic number determines the chemical properties of the atom
Atomic Mass The combined mass of all of the protons and neutrons of an atom. Since each proton and neutron has a mass of approximately one unit (called an atomic mass unit) the atomic mass is approximately equal to the number of protons and neutrons.
Period a horizontal row on the periodic table
Group a vertical column on the periodic table
Family a group
Chemical Formula a group of chemical symbols and numbers that shows the number of atoms of each element in a molecule
Metals an element that conducts heat and electricity well, is shiny, and can be hammered into sheets or drawn into wires
Nonmetals an element that does not conduct heat or electricity well and is dull and brittle or gaseous
Metalloids an element that has some properties of both metals and nonmetals
Noble Gases the six elemental gases that does not naturally react with other elements
Reactivity the tendency of a substance to undergo chemical changes
Dmitri Mendeleev Russian chemist who developed a periodic table of the chemical elements and predicted the discovery of several new elements
Trend(patterns on the periodic table) specific patterns found in the periodic table, includes patterns in size and electronic properties
Energy Level the energy level increases as the number of electrons increases and the atom needs more electron shells
Valence Electrons an electron that is associated with an atom, and that can participate in the formation of a chemical bond
Chemical Property a characteristic of a substance that cannot be observed without changing the identity oft he substance
Physical Property a characteristic of a substance that can be observed directly or measured with a tool without changing the identity of the subsance
Created by: NatCal2020