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unit 3 lessons 1 + 2
matter and energy
Question | Answer |
---|---|
atom | the smallest particle into which an element can be divided into anything simplier |
electrons | these negatively charged particles |
nucleus | a small dense center that has a positive charge and is surrounded by moving electrons |
protons | the positively charged particles in nuclues |
nuetrons | uncharged particles |
electron cloud | electrons move within an area around the nucleus |
atomic number | number of protons in nucleus of atom |
mass number | number of protons and neutrons in nuclues |
periodic table | arrangement of elements |
chemical symbol | abbreviation for the elements name |
average atomic mass | an atom is weighted average of the masses of all the naturally occurring isotopes of that element |
metal | elements are shiny and conduct-heat and electricity well |
nonmetal | poor conductors of heat and electricity |
metalliods | both property of metals and non metals |
group | vertical column of eleents |
period | horizontal row of elements |