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

1. ground state: lowest energy position of an electron in an atom

2. photon: packet of energy of specific size

3. neutron: neutral subatomic particles found in the nucleus of the atom

4. protons: positively charged, subatomic particles found in the nucleus of the atom

5. electrons: negatively charged, subatomic particles

6. orbital: the path of an electron around the nucleus of an atom

7. element: substance with only one type of atom

Explanation:

An atom is smallest unit of a matter or substance.It consist of three subatomic particles : electrons, protons, neutrons.

Protons, the positively charged particles and neutrons, the neutral particles are located in the center of an atom where mass of an atom is concentrated.

Electrons , the negatively charged particles are located outside the nucleus where they orbit in different energy levels around the nucleus called as orbitals.

The electrons absorb energy in the form of photons which are packets of fixed energy and thus the electrons move from lowest or ground state orbitals to move to higher energy or excited state orbitals.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.