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17 terms

electrons and atoms

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electron
travels around and outside the nucleus; is negative
ionic bond
a bond formed by the electrical attraction between oppositely charged ions
salt
a compound that forms after a base and an acid is combined
covalent bond
a bond that happens when atoms share pairs of electrons
synthesis reaction
when there is a combination of two or more substances and a compound results
double replacement reaction
two elements switch places
atomic theory
what scientists think about atoms based on repeated observations of how atoms act in experiments
molecules
atoms held together by chemical forces
single replacement reaction
one element replaces another
groups
a column of the periodic table of the elements
pH
the amount of an acid or base in a solution
chemical formula
a method that uses chemical symbols and numbers to show the makeup of a compound
periods
a horizontal row of the periodic table of the elements
indicator
changes color when exposed to acid or base solution
NaCI
sodium chloride salt substitute
decomposition reaction
when compounds break apart
acid
a compound that forms hydroxide (oH-) when dissolved in water