9/16/2023 0 Comments Ns2 np3![]() ![]() (i) Calculate the number of electrons which will together weigh one gram. Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.įor an isolated system, ΔU = 0, what will be ΔS? (ii) Calculate the mass and charge of one mole of electrons. What is meant by the term bond order? Calculate the bond order of: N 2, O 2,O 2 +,and O 2 -.Ģ.9 g of a gas at 95 ☌ occupied the same volume as 0.184 g of dihydrogen at 17 ☌, at the same pressure. What is the molar mass of the gas?Ĭalculate the temperature of 4.0 mol of a gas occupying 5 dm 3 at 3.32 bar.Some heavier elements of the III, IV & V group having configuration of outer most shell ns2 np1 ns2 np2 ns2 np3 show valencies with a difference of 2 i.e (1 & 3) ( 2 & 4 ) ( 3 & 5) respectively. In case of lower valencies, only electrons present in p-subshell are lost and s-electrons remain intact. The reluctance of s-electron pair to take part in bond formation is known as ‘inert pair effect’. When sufficient energy is available, the s-electrons also enter into bond formation and higher valencies are observed. This tendency to show higher valencies is less in Tl, Pb & Bi but more in Sn, In & Sb etc. In a multi electron atom, the electrons present between the nucleus and the valence shell i.e inner electrons shield the valence electrons from the nucleus.
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