look at your periodic table. Groups are vertical. For instance, the second Na,S,Al,Cl is not a group.
Then for the groups shown, the least protons will be a the top of the group, and going down increasing in protons.
Which arrangement below lists elements of the same group, in order, from those having least protons to those having the most protons?
o,s,se,te
na,s,al,cl
o,n,b,ki
rb,k,na,li
1 answer