Question

hii plz say me about ionization enthalpy and ionic size
.....

cbse ,class 11

.....

Answer 1

(I.E.) that is ionization energy or enthalpy is the amount of energy required to remove an electron from isolated gaseous atom.

NOW,,,What is isolated gaseous atom ???
it is the single gaseous atom separated by its other gaseous atoms.

Ionic size is the size of ion.
Example - CL^- ,,Na^+.