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Atoms, periodic tabl

Unit 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 charge and is surrounded by moving electrons
Proton Positively charges particles
Neutron Uncharged particles
Electron Cloud A region around the nucleus where electrons are likely to be found
Atomic Number The number of protons in the nucleus
Mass Number Total number of protons and neutrons in an atoms nucleus
Periodic Table An arrangement of the elements in order of their atomic number
Chemical Symbol Abbreviation for the elements name
Average Atomic Mass Weighted average of the masses of all naturally occurring isotopes of that element
Metal Elements that are shiny and conduct heat and electricity well
Nonmetal Poor conductors of heat and electricity
Metaloid Elements that have some properties of metals and some properties of nonmetals
Group Vertical columns of elements on the periodic table
Period Horizontal row of elements on the periodic table
Created by: 18mboaz1106