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Unit 3 Ls 1 + 2


atom is 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 charge and is surrounded by moving electrons.
proton Positively charged particles in the nucleus.
neutron uncharged particles.
electron cloud electrons move within 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 neutrons in an atoms nucleus.
periodic table Mandeleevs arrangement of the elements.
chemical symbol is an abbriviation for the elements name.
average atomic mass of an atom weighted average of the masses of all the naturally occuring isotopes of that element.
metal are elements that are shiny and conduct heat and electricity.
nonmetal are poor conductors of heat and electricity.
metalloid are elements that have some properties of metals and some properties of nonmetals.
group vertical column of elements on the periodic table.
period each horizontial row of elements on the periodic table.
Created by: 18esmith0528