Why are some objects heavier than others?

Match each vocabulary term to its definition. 1. electrons neutral subatomic particles found in the nucleus of the atom 2. neutron lowest energy position of an electron in an atom 3. photon the path of an electron around the nucleus of an atom 4. ground state negatively charged, subatomic particles 5. protons packet of energy of specific size 6. element substance with only one type of atom 7. orbital positively charged, subatomic particles found in the nucleus of the atom

When using the scientist method, which step comes last?

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of energy.