The ionic bond `X^(+)Y^(-)` are formed when :
(I) electron affinity of Y is high (II) ionization energy of X is low
(III) lattice energy of XY is high (IV) lattice energy of XY is low
Choose the correct code :

Ionic compounds are formed most easily with (A) Low electron affinity, high ionization energy (B) High electron affinity, low ionization energy (C) Low electron affinity, low ionization energy (D) High electron affinity, high ionization energy

The ionization energy of He^(+) is x times that of H. The ionization energy of Li^(2+) is y times that of H. find |y-x|

An element with low ionization energy combines with an element having high electron affinity to form

X-rays are produced when an element of high atomic weight is bombarded by high energy:

The ionisation energies for B.Tl and In are X.Y and ZK cal/mol respectively. Choose the correct relationship between them-