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unit 3
lessons 1-2
Term | Definition |
---|---|
atom | the smallest particle into an element can be divided |
electrons | negatively charged particles |
nucleus | a small, dense, center of a positively charged and is surrounded by moving electrons |
proton | positively charged particles |
neutrons | uncharged particles |
electron cloud | area surrounded by a nucleus |
atomic number | the number of protons in the nucleus of an atom |
mass number | total number of protons and neutrons in an atom |
periodic table | the repeating element |
chemical symbol | an abbreviation for the elements name |
average atomic mass | an atom is the weighted average of all naturally occurring isotopes of that elements |
metals | elements that are shinny and conduct heat and electricity as well. |
nonmetals | poor conductors of heat and electricity |
metalloids | elements that have some properties of metals and properties of nonmetals. |
group | each column and elements on the periodic table |
period | each horizontal row in the periodic table |