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unit 3 matter/energy
unit 3 lesson 1&2
Term | Definition |
---|---|
atom | smallest particle into which an element can be divided and still be the same element |
electrons | negative charged particles |
nucleus | small dense center positive charge surronded by moving electrons |
proton | positively charged |
neutron | have no electric charge |
electron cloud | negative particles moving around nucleus |
atomic number | number of protons in the nucleus of an atom |
mass number | total number of protons and neutrons in atoms nucleus |
periodic table | arrangement of elements |
chemical symbol | abbreviation for an elements name |
average atomic mass | atom is the weighed average of masses of all the naturally occuring isotopes of that element |
metals | elements that are shiny and conduct heat and electricity |
nonmetals | poor conductors of heat and energy |
metalloids | some properties of metals and nonmetals |
group | vertical line in the periodic table |
period | horizontal row of elements on periodic table |