click below
click below
Normal Size Small Size show me how
unit 3, lesson 1&2
vocab
Term | Definition |
---|---|
atom | the smallest particle into which an element can be divided and still be the same element |
electron | negatively charged particles that are found in the atom |
nucleus | a small, dense center that has a positive charge and is surrounded by moving electrons |
proton | the positively charged particles in the nucleus |
neutron | uncharged particles in the nucleus |
electron cloud | electrons move within an area around the nucleus |
atomic number | number of protons in the nucleus of an atom |
mass number | total number of portions and neutrons in an atom's nucleus |
periodic table | arrangement of he elements |
chemical symbol | abbreviation for the element's name |
average atomic mass | the weighted average of the masses of all the naturally ouccurring |
metals | elements that are shiny and conduct heat and electricity well |
nonmetals | poor conductors of heat and electricity |
metalloids | elements that have some properties of metals and some properties of nonmetals |
group | vertical column of elements with similar properties together |
period | horizontal row of elements on the periodic table |