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

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.
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