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
To find the arrangement that lists elements of the same group from least protons to most protons, we need to determine which elements belong to the same group and compare their atomic numbers (number of protons).
Let's analyze each arrangement:
1. o, s, se, te
In this arrangement, oxygen (O) and sulfur (S) belong to the same group, but selenium (Se) and tellurium (Te) do not. Additionally, the order does not go from least protons to most protons, as oxygen has fewer protons than sulfur. Therefore, this arrangement is not the correct answer.
2. na, s, al, cl
In this arrangement, sodium (Na) and aluminum (Al) belong to the same group (Group 1), but sulfur (S) and chlorine (Cl) do not. However, the order does not go from least protons to most protons, as sodium has fewer protons than aluminum. Therefore, this arrangement is not the correct answer.
3. o, n, b, ki
In this arrangement, nitrogen (N) and boron (B) belong to the same group (Group 15), but oxygen (O) and potassium (K) do not. Additionally, the order does not go from least protons to most protons, as oxygen has fewer protons than nitrogen. Therefore, this arrangement is not the correct answer.
4. rb, k, na, li
In this arrangement, rubidium (Rb), potassium (K), sodium (Na), and lithium (Li) belong to the same group (Group 1). The order goes from least protons to most protons, as lithium has the fewest protons, followed by sodium, potassium, and rubidium. Therefore, this arrangement is the correct answer.
Therefore, the arrangement that lists elements of the same group in order from least protons to most protons is: rb, k, na, li.
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.