`{:(Column I,Column II),((A)H,(p)"Radius of"4^(th)"orbit"0.53 xx 4overset(0)(A)),((B)He^(+),(q)"Energy of"2^(nd)"orbit"=-13.6eV),((C)Be^(3+),(r)"Radius of"2^(nd)"orbit"=0.53 xx 4overset(0)(A)),((D)Li^(2+),(s)"Velocity of electron in the 3rd orbit"=2.18 X 10^(8)cm//sec):}`

Answer

A-r, B-q, C-p, D-s

Explanation

`r_(n,z) prop (n^(2))/(z)`
`rarr U_(n,z) prop -(z^(2))/(n^(2)), " "rarr KE_(n,z) prop (z^(2))/(n^(2))`
`rarr T_(n,z) prop -(z^(2))/(n^(2)), " "rarr V_(n,z) prop (z)/(n)`