5. ______ is the basic unit of all elements of a matter.
6. An atom that contains fewer electrons than protons is said to be _______ charge.
7. A particle that contains more electrons than protons is ______ charge.
8. If an atom contains equal numbers of electrons and protons, the atoms are described as _______.
a. atom b. electrically neutral
c. electron d. negatively
e. neutron f. nucleus
g. positively h. proton
