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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

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