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Unit 3 Lessons 1,2
Term | Definition |
---|---|
atom | the smallest particle into which element can be divided and still be the same element |
electron | negatively charged particles |
nucleus | a small, dense center that has a positive charge |
proton | positively charged particles in the nucleus |
neutron | particles with no electric charge |
electron cloud | negatively charged parts of an atom |
atomic number | the number of protons in the nucleus in he atom |
mass number | the total number of protons and neutrons in the atoms nucleus |
periodic table | the arrangement of elements |
chemical symbol | a one,two,or three letter of a name of an element |
average atomic mass | the weighted average of the average |
metal | a element that is shiny and conducts heat |
nonmetal | an element that conducts heat |
metalloid | an element that has properties of both metals and nonmetals |
group | a vertical column of elements |
period | in chemistry, a horizontal row of elements |
chemical bond | an interaction that holds atoms |
valence electron | an electron that is found in the outermost shell |
ion | a charged particle |
ionic bond | the attraction between ions |
covalent bond | a bond formed when atoms share one or morepairs of electrons |
molecule | a group of atoms that are held together |
metallic bond | a bond formed by attration between positivley charged ions |