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Unit 4 Vocab

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 a one or two letter code that stands for an element
period A ROW of elements in the periodic table arranged by atomic number
group column of elements in periodic table, which elements have certain properties in common (chemical family)
matter material that all objects and substances are made of; anything with mass and space
element substances that are the building blocks of all matter; made up of 1 kind of atom
compound matter made of 2 or more elements; chemically bonded (can't be separated by physical means)
atom smallest particle into which an element can be divided and still have the properties of that element
electron negatively charged particle on the outside of the nucleus of an atom
nucleus center of an atom, made up of protons and neutrons
proton positively charged particle located in the nucleus of an atom
neutron small particle in nucleus of an atom with no electrical charge
energy level the amount of energy carried by electron in an atom; determines electron's average distance from nucleus
isotope atoms of the same element with different numbers of neutrons in the nucleus and thus different atomic masses
Mass number sum of protons and neutrons in nucleus of an atom
Atomic number number of protons in the nucleus of one atom of an element
metal elements,usually solid, with a shiny surface; conduct electricity and thermal energy well
malleable element that has some characteristics of both metals and nonmetals
ductile term used to describe a material that can be pulled out into a long wire
conductivity ability of an object to transfer heat or electricity to another object
reactivity the ease and speed with which an element combines or reacts with other elements and compunds
corrosion way in which acids react with some metals so as to eat away the metal
Alkali metal Elements in Group 1 of periodic table
Alkaline earth metal Elements in Group 2 of periodic table
Transition metal one of the elements in Groups 3-12 of periodic table
alloy mixture of 2 or more elements, one of which is a metal
nonmetal element that lacks most of the properties of a metal
Diatomic molecule molecule consisting of 2 atoms
halogen Elements found in Group 17 of periodic table
Noble gas Elements found in Group 18 of periodic table
metalloid element that has some characteristics of both metals and nonmetals
semiconductor substance that can conduct electricity under some conditions
Created by: yannaaa