Structure and Function of Subatomic Particles. *The identity of an atom is determined by the number of it contains. *The number of in an atom is referred to as the atom’s .
*The number of in an atom is referred to as the atom’s .
*On the , the elements are listed in order of their , which is the large whole number
in each box.
# of Protons =
*In a neutral atom, the number of protons equals the number of .
Since the electron has an insignificant mass, the mass of an atom only depends on the number of and the atom has.
Protons + Neutrons =
*Na-22 and Na-23 both have 11 protons and 11 electrons, but have 11 and 12 neutrons, respectively.
*Na and Na+1 both have 11 protons, but have 11 and 10 electrons, respectively.