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Matter and Energy

Unit 3 Lessons 1-2

TermDefinition
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 charge and is surrounded by moving electrons.
proton 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 neutrons in an atom's nucleus.
periodic table an arrangement of the elements in order of their atomic numbers such that elements with similar properties fall in the same column, or group.
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.
metal elements that are shiny and conduct heat and electricity well.
nonmetal poor conductors of heat and electricity.
metalloid elements that have some properties of metals and some properties of nonmetals.
group each vertical column of elements (from top to bottom) on the periodic table.
period each horizontal row of elements (from left to right) on the periodic table.
Created by: 18kielyc0311