On the basis of energy sequence of subshells, show that there are 32, elements in the 6th period.

On the basis of electronic configuration how will you identify the first element in a period?

On the basis of rate equation show that a fist order reaction does never go to completion. For an elementary reaction A + B rarr C , the rate constant increases 10 times on increasing the temperature from 27^@C by 10 degrees, Find out the activation energy of the reaction.

On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.

First ionisation energy of elements increases with atomic numbers of the elements in a period-why cite an exception.

The electronic configuration of an element is 1s^2 2s^2 2p^6 3s^2 3p^4 . The atomic number of the element present just below the above element In the periodic table.

Explain why, the properties of elements are repeated 2,8,18 and 32 elements in the periodic table.

The following geometric arrays suggest a sequence of numbers. (a) Find the next three terms . (b) Find the 100^(th) term . (c) Find the n^(th) term . The dots here arranged in such a way that they form a rectangle. Here T_1 =2 , T_2 = 6 , T_3 = 12 , T_4 = 20 and so on. Cay you guess what T_5 is ? What about T_6 ? What about T_n ? Make a conjecture about T_n .

Out of the following in how many pairs energy sequence is reversed after filling electron (for all element Zgt1 ) 6slt5d

Show that for a particle in linear SHM, the average kinetic energy over a period of oscillation equals the average potential energy over the same period.