What do elements in the groups 1A through 8A have in common? (Choose all that apply)
a, they all have similar properties
b. they were all discovered around the same time
c. they all have the same number of energy shells
d. they all have the same number of valence electrons
e. they all will have the same oxidation states for the ions they form
a. they all have similar properties
d. they all have the same number of valence electrons
e. they all will have the same oxidation states for the ions they form