Matching: place the name of the scientist in the blank next to their ideas about the atom.
democritus, thomson, rutherford, bohr
. he said that all positive charges were found in the central nucleus.
. he theorized that electrons were imbedded in the positive sphere, like a
chocolate chip cookie.
. he believed electrons were in fixed orbits.
. he named the atom

Explanation:

Rutherford → He said that all positive charges were found in the central nucleus.

Rutherford in 1909 , explained through his model that an atom is mostly an empty space with with electrons around the nucleus where all the positive charge is located.

Thomson → He theorized that electrons were embedded in the positive sphere, like a  chocolate chip cookie.

Thomson in 1904 , explained through his model that in an atom is a positive sphere of on which electrons are embedded similar plums on the plum pudding. Also an atom is electrically neutral specie.

Bohr → He believed electrons were in fixed orbits

Bohr in 1913 , explained through his model that in an atom , electrons revolves around the nucleus of an atom in a fixed orbits with foiced amount of energy which he named shells.

Democritus → He named the atom

A Greek philosopher who has used the term atom to describe the smallest u it of matter.

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products