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Atoms/Periodic Table
Unit 3
Term | Definition |
---|---|
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 | A small, dense center that has a positive charge and is surrounded by electrons |
Proton | Positively charged particles in the nucleus |
Neutron | Uncharged particles in an atom |
Electron Cloud | An area around the nucleus that electrons move in |
Atomic Number | The number of protons in the nucleus of an atom |
Mass Number | The total number of protons and neutrons in an atom |
Periodic Table | Mendeleev's arrangement of the elements |
Chemical Symbol | An abbreviation of an elements name |
Average Atomic Mass | The 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 |
Metalloid | Elements that have some properties of metals and nonmetals |
Group | A vertical column of elements on the periodic table |
Period | A horizontal row of elements on the periodic table |