The atomic number of the elements X and Y are 20, 26 respectively. When these ele-ments combines with chlorine, three com-pounds `XCI_2,YCI_2,YCI_3`areformed: What is the speciality of the oxidation number of Y,compared to thatof X?

The atomic number of the elements X and Y are 20, 26 respectively. When these ele-ments combines with chlorine, three com-pounds XCI_2,YCI_2,YCI_3 areformed: Explain the reasonfor this,on the basis of the subshellbased electronic configu- ration.

The atomic weights of two elements (A and B) are 20 and 40 respectively. If x % of A contains y atoms, how many atoms are present in 2x g of B?

11,17,10 are the atomic number of elements X,Y and Z: Write down the oxidation numbers of the elements in the compound formed by any two of the element. Write the subshell electronic configuration of both ions.

P,Q,R,S are four elements. Their atomic numbers are 8,17,12 and 16 respectively. Find the type of chemical bond in these compounds formed by combining the following pairs of elelments. Construct and exhibit the type of bonds using different substances (eg. pearls) (Electronegativity values: P=3.44,Q=3.16,R=1.31, S=2.5) . P,S

P,Q,R,S are four elements. Their atomic numbers are 8,17,12 and 16 respectively. Find the type of chemical bond in these compounds formed by combining the following pairs of elelments. Construct and exhibit the type of bonds using different substances (eg. pearls) (Electronegativity values: P=3.44,Q=3.16,R=1.31, S=2.5) . P,R

P,Q,R,S are four elements. Their atomic numbers are 8,17,12 and 16 respectively. Find the type of chemical bond in these compounds formed by combining the following pairs of elelments. Construct and exhibit the type of bonds using different substances (eg. pearls) (Electronegativity values: P=3.44,Q=3.16,R=1.31, S=2.5) . Q,R

11,17,10 are the atomic number of elements X,Y and Z: Write the molecular formulac of the compound formed when any two of the above elements are combined.