1.

(a) What are the atomic numbers of elements whose outermost electronic configurations are given by (i) 3s1 (ii) 3p5 ? (b) Which of the following are isoelectronic species? Na+, K+, Mg2+,Ca2+, S2-,Ar (c) What will be the wavelength of a ball of mass 0.1kg moving with a velocity of 10 ms-1 ?

Answer»

(a) (i) 3s1 - Atomic number is 11 (Na) 

(ii) 3p5 - Atomic number is 17 (Cl)

(b) Na+, Mg2+ (both of them have same no. of electrons, i.e.,10 each)

(c) λ = \(\frac{h}{mv}\) = \(\frac{6.626\times10^{-34}Js}{0.1kg\times10ms^{-1}}\) = 6.626 x 10-34m



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