Mrs. Lewis’s 2nd Block

Term Definition
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.
Chemical Symbol One or two letter code that stands for and element.
Period A row of elements in the periodic table arranged by atomic number.
Group Column of elements have certain properties in common also called chemical family.
Matter The material that all objects and substances are made of anything that has mass and takes up space.
Element Substances that are the building blocks of all matter
Compound Matter made of two or more elements.
Atom Smallest particle into which an element can be divided and still have the properties of that element.
Electron Negatively charged particle found outside the nucleus of an atom.
Nucleus Structure near the center of a cell that contains the cells DNA.
Proton Positively charged particle with neutral charge lovated in the nucleus.
Energy Level The amount of energy carried by an electron in an atom determines the electrons average in an atom.
Nuetron In an atom particle with nuetral cahrge located in the nucleus.
Isotope Atoms of the came element with different number of nuetrons in the nucleus and thus different atomic masses.
Atomic Number Number of protons in the nucleus of one atom of an element.
Metal Elements usually solid with a shiny surface metals conduct.
Malleable A term tha used to describe material that can be pounded into shapes.
Ductile A term used to describe a material that can be pulled out into a long wire.
Conductivity The ability object to transfer heat or electricity.
Reactivity The ease and speed with which an element combine
or reacts.
Corrosion The gradual wearing away of a metal element due to chemical reaction.
Alakali Metal An element in Group 1 of the periodic table.
Alakine Earth Metal An element in Group 2
Transition Metal Element in Group3 through 12.
Alloy A mixture of two or more elements one of which is metal.
Nonmetal An element that lacks most of the properties of metal.
Diatomic Molecule A molecule consisting of two atoms.
Halogen An element found in Group 17 Periodic Table.
Nobel Gas An element in Group 18
Metalloid An element that has both metals and nonmetals.
Semiconductor A substance that can conduct electricty under same condition.