Rank the following atoms in order decreasing atomic radii: C,N,B,Al.

Question

Quizplus · Accepted Answer

Al has the largest atomic radius due to the increase in the number of energy levels/shells as we move down the periodic table. 
B has a slightly smaller atomic radius than Al as it is located to the left of Al in the same period, so it has one less energy level than Al. 
C has a smaller atomic radius than both Al and B as it is located further to the right in the same period, resulting in a larger nuclear charge, and therefore a smaller atomic radius. 
N has the smallest atomic radius as it is located to the right of C in the same period, with a greater nuclear charge than C.

Rank the Following Atoms in Order Decreasing Atomic Radii: C,N,B,Al