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Matter and Energy
Unit 3 Vocabulary
Term | Definition |
---|---|
atom | the smallest particle into which an element can be divided into and still be the same element |
electron | negatively charged particles |
nucleus | a small, dense center that has a positive charge |
proton | positively charged particles from in the nucleus |
neutron | uncharged particles |
electron cloud | the area in which electron move that is around the nucleus |
atomic number | the number of protons in the nucleus of an atom |
mass number | the total number or protons and neutrons in an atom's nucleus |
periodic table | the arrangment of elements |
chemical symbol | an abbreviation for the elements 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 | a vertical column of elements on the periodic table |
period | a horizontal row of elements on the period table |