What are the used of (i) He, (ii) Ne , (iii) Ar , (iv) Kr ?

He, H , Ne , Ar

How many electrons are unpaired in (i) He ? (ii) C? (iii) N? (iv) K?

Find : ( i ) (ii) (ii) (iii) (iii) (iv)

Indicate the number of unpaired electrons is (i) P (ii) Si (iii) Cr (iv) Fe (v) Kr .

Which of the noble gases can be described in terms of either covalent radii or van der Waals radii? (i) Xe (ii) Ar (iii) Kr (iv) Ne

What are isoelectronic species? Name one isoelectronic species for (i) F^(-) , (ii) Ar (iii) Mg^(2+) , (iv) Rb^(+) .

Match the following a. (i)- (r), (ii)- (p), (iii)- (s), (iv)- (q) b. (i)- (s), (ii)- (p), (iii)- (q), (iv)- (r ) c. (i)- (r), (ii)- (q), (iii)- (p), (iv)- (s) d. (i)- (r), (ii)- (p), (iii)- (q), (iv)- (s)

Write the Lewis dot symbols of the following elements and predict their valencies :(i) Na (ii) Mg (iii) P (iv)S(v)Cl (vi) Ar.

Write the Lewis dot symbols of the following elements and predict their valencies :(i) Na (ii) Mg (iii) P (iv)S(v)Cl (vi) Ar.