[" 19) -2.2 times 10-is Jatom-" "],[" The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [a,is Bohr radius] "],[[" (1) "(h^(2))/(4 pi^(2)ma_(0)^(2))," (2) "(h^(2))/(16 pi^(2)ma_(0)^(2))," (3) "(h^(2))/(32 pi^(2)ma_(0)^(2))]],[" 23."Ce^(3+)," La "^(3+),Pm^(3+)" and "Yb^(3+)" have lonic radil in the increasing order as - "]