The first member of p-block differ from the remaining members of their corresponding group in two major respects. Explain

Explain the folloiwng facts: The metallic radii of the 3rd (5d) series of transition metals are nearly the same as those of the corresponding members of the 2nd series.

The perimeter of two similar triangles are respectively 25cm. and 15 cm. If one side of the first triangle is 9 cm.,find the corresponding side of the second triangle.

The position-time (x-f) graphs for two children A and B returning from their school O to their homes P and Q respectively are shown in the giure chosse the correct entires in the brackets below, (A/B) lives closer to the school than (B/A)

An army contingent of 616 members is to march behind an army band of 32 members in a parade. The two groups are to march in the same number of columns.What is the maximum number of columns in which they can march?

An army contingent of 1000 members is to march behind an army band of 56 members in a parade. The two groups are to march in the same number of columns. What is the maximum number of columns in which they can march?

The first term and common difference of an A.P. are respectively 4 and 2. If the sum up to n terms is 88, find n.