The position of elements A, B, C, D in the modern periodic table is given in the following table. Answer the following questions by observing the table: 
`{:(,"Group 1","Group 2"),("Period 3",A,B),("Period 4", C,D):}`
i] Which element has the highest atomic size? Why?
ii] Which element has the least metallic property? Why?

Explanation

i] C has highest atomic size since atomic size increases down a group and decreases along a period from left to right.
ii] B has least metallic property since metallic property increases down a group and decreases along a period.