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Q. Show the rate of decrease in atomic radius?
The rate of decrease in atomic radius along the lanthanide series and also along the actinide series is even less than that in the transition cries, since the difference in the electronic configurations of these component is in the number of electrons in the ante-penultimate (last but two) shell of electrons. But the additive effect of decrease in atomic radius across the fourteen elements of lanthanide series is quite substantial. This decrease in atomic radius across the lanthanide series is defined as lanthanide contraction. Similarly, there is an actinide contraction across the actinide series. As a result of lanthanide contraction, the normal gain in size from Sc+Y+La disappears after the lanthanides. And pairs of elements such as Hf and Zr, Nb and Ta, Mo and W, etc., possess nearly similar sizes. His properties of these elements, thus, are very similar. The similarities in properties within these pairs make their separation very difficult. Thus, due to lanthanide contraction the elements of 5d and 4d transition series resemble each other much more nearly than do the elements of 4d and 3d series.
The frequency of radiation emitted when the electron falls from n= 4 to n=1 in a hydrogen atom will be (Given ionization energy of H = 2.18x 10 -18 J atom-1 and h= 6.625x 10-
Types of addition reactions Addition reactions can be categorized into three categories on the basis of the nature of initiating species. (A) Electrophilic additions (B)
Every precipitate will be collected using a Hirsch funnel. Make definite that the plastic frit disc is firmly snapped in place in your focus. Replacement frit discs are available
synthesis of an aldehyde from an alkyl halide with 1C chain extension
I put an unknown solid acid into a base solution. How do I find the equivalents of base consumed?
convert n-propyl alcohol to iso propyl alcohol
Radius of the first Bohr's orbit of hydrogen atom is: (1)1.06 Å (2) 0.222 Å (3) 0.28 Å (4)0.53A Ans: 0.53 Å
what are the different types of method for the preparation of DDT?
What will be de-Broglie wavelength of an electron moving with a velocity of 1.2 x 10 5 ms -1 : (1) 6.068x 10 -9 (2) 3.133 x 10 -37 (3) 6.626x 10 -9
Six protons are found in the nucleus of : (1) Boron (2) Lithium (3) Carbon (4 )Helium Ans: Carbon
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