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Unit 4 Vocabulary

Atomic Mass Average mass of one atom of an element
Periodic Table A chart where all elements are organized into periods and groups according to their properties
Period A row of elelments in the periodic table arranged by atomic number
Chemical Symbol One or two-letter code that stands for an element
Group Column of elements in the periodic table, which have certain properties in common
Matter Anything that has mass and takes up space
Element Substances that are the building block of matter
Compound Matter made of two or more elements
Atom Smallest particle
Electron Negatively charged particle, found outside nucleus of atom
Nucleus Center of an atom
Proton Positively charged particle, in nucleus of atom
Neutron Neutral charge, in nucleus of atom
Energy Level The amount of evergy carried by an electron in a atom
Isotope Atoms of the some element with different numbers of neutrons in the nucleus of atom
Mass Number The sum of protons and neutrons in the nucleus of a atom
Atomic Number Number of protons in the nucleus of one atom of an element
Metal A class of elements characerized by physical properties
Malleable A term used to describe material that can be pounded into shapes
Ductile A term used to describe material that can be pulled out into a long wire
Conductivity The ability of an abject to transfer heat or electricity to another object
Reactivity The ease and speed with ehich an element combines, or reacts with other elements and compounds
Corrosion The gradual wearing away of a metal element due to a chemical reaction
Alkali Metal An element in Group 1 of the periodic table
Alkali Earth Metal An element in Group 2 of the periodic table
Transition Metal One of the elements in Group 3 through 12 of the periodic table
Alloy A mixture of two or more elements, one of which is metal
Nonmetal An element that lacks most of the properties of a metal
Diatomic Molecule A molecule consisting of two atoms
Halogen An element found in Group 17 of the periodic table
Nobel Gas An element in Group 18 of the periodic table
Metaloid An element that has come characteristics of both metals and nonmetals
Semiconductor A substance that can conduct electricity under some conditions
Created by: Grey Gasai