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Unit 3: Lesson 1-2

This will help me get a great grade on finals!!!

Atom The smallest particle into which an element can be divided and still be the same element.
Electron Negatively charged particles in an atom.
Nucleus Center of an Atom that has a positive charge that is surrounded by electrons.
Proton Positively charged particles in the nucleus.
Neutron Uncharged particles in the nucleus.
Electron Cloud Electrons move within an area around the nucleus. (Theory)
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 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.
Metal Elements that are shiny and conduct heat and electricity well.
Nonmetal Poor conductors of head and electricity.
Metalloid Elements that have some properties of metals and some properties of nonmetal.
Group Each vertical column of elements on the periodic table.
Period Each horizontal row of elements on the periodic table.