1. the part of the atom that is found in the area outside the nucleus is the a. proton b. neutron c. electron 2. the chemical combination of two or more atoms in fixed amounts is called a a. mixture b. orbit c. compound 3. the smallest part of a compound that still is that compound is a a. mixture b. molecule c. nucleus 4. the part of the atom that is electrically neutral. a. electron b. proton c. neutron