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unit 3 book 3


atom the smallest particle into which an element can be divided and still be the same element.
electron negatively charged particles.
nucleus a small, dense center that has a positive and is surrounded by moving electrons.
proton the positively charged particles in the nucleus.
neutron uncharged particles in the nucleus.
electron cloud an area around the nucleus.
atomic number the number of protons in the nucleus of an atom.
mass number the total number of protons and
periodic table Mendeleev's arrangement of the elements
chemical symbol an abbreviation for the element's name
average atomic mass the weighted average of the masses of all the naturally occurring isotopes of that element
metals elements that are shiny and conduct heat and electricity
nonmetals poor conductors of heat and electricity
metalloids elements that have some properties of metals and some properties of nonmetals
group each vertical column of elements on the periodic table
period each horizontal row of elements on the periodic table
chemical bond an interaction that holds atoms r ions together
valence electrons
Created by: madness25