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what are

ISOELECTRONIC SPECIESand give examples.velocity of electron in 3rd shell of Li

^{+2}is (c=velocity of light)1. 1/137 c

2.1/274 c

3.2/137c

Why is Fe

^{3+ }ion more stable than Fe^{2+}ion?With what velocity should an alpha particle travel towards the nucleus of a copper atom so as to arrive at a distance 10

^{-13}m from the nucleus of a copper atom?drawbacks of j j thomson atomic models

In an atom two electrons move around the nucleus in circular orbit of radii R and 4R. The ratio of time taken by them to complete one revolution is

(a)1:8 (b)4:1 (c)1:4 (d)8:7

explain pauli's exclusion principle

_{e}=9.11x10^{-31}KgWhat's is hunds rule of maximum multiplicity Explain with many example and how is it different from the other

Why is electron gain enthalpy of chlorine is more than fluorine?

a) 2pi x

b) 6pi x

c)9x

d)x/3

why electon cannot exist in the nucleus?

what is likely to be the quantum number for a circular orbit of diameter 20nm of the hydrogen atom if we assume bohr orbit to be same as that represented by the principal quantum number?

calculate mass of photon with wavelength 3.6 A

^{.}?Calculate the energy associated with the 1st orbit of He+. What is the radius of the orbit?

Pls give the answer in steps..!

^{+}to the second state of hydrogen isa. 32/27

b.27/32

c.1/54

d.27/2

ratio of e/m of electron and alpha particle is

^{16}Hz, emits photoelectrons with twice kinetic energy as did photo electrons when the same metal is irradiated by light of frequency 2*10^{16}Hz. Find the threshold frequency of the meatl?a block of mass 'm' is placed on a smooth wedge of inclination of theta.the whole system is accelerated horizontally so that the block does not slip on the wedge.The force exerted by the wedge on block has a magnitude.

E1=-13.6eV , E2= -3.4eV, E3=-1.5eV ,E4=-0.85eV ,E5=-0.54eV

Calculate the wave number for the longest wavelength transition in the Balmer series of atomic hydrogen.

What is the derivation of the radius of the n

^{th}orbit in bohr's model?the formula is R

_{n}= (4πε_{0})n^{2}h^{2 }/ 4π^{2}me^{2}Q.) Which transition of Li

^{2+ }is associated with same energy change as n=6 to n=4 transition in He^{+}.(I) n=3 to n=1 (II) n=8 to n=6 ( III) n=9 to n=6 (IV) n=2 to n=1

Write the electronic configuration of (i) Mn4+, (ii) Fe3+ (iii) Cr2+ and Zn2+ Mention the number of

unpaired electrons in each case.

Why do half filled and completely filled orbitals have extra stability?