7. The incorrect statement out of the following is(A) Iso electronic ions may be obtained form elements belonging to different periods of the periodic table(B) Electron affinity of noble gases is zero.(C) van der Waal’s radii of iodine is more than its covalent radius(D) X− ion is formed with more ease in fluorine than in chlorine.

Radhika Batra , 11 Years ago

Grade 11