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what are

ISOELECTRONIC SPECIESand give examples.Why is Fe

^{3+ }ion more stable than Fe^{2+}ion?drawbacks of j j thomson atomic models

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.

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

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

Pls give the answer in steps..!

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

calculate mass of photon with wavelength 3.6 A

^{.}?why electon cannot exist in the nucleus?

ratio of e/m of electron and alpha particle is

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

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

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

unpaired electrons in each case.

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}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

Calculate the wavelength of first and last line in the Balmer series of Hydrogen spectrum.

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

state Heisenberg's Uncertainty principle?

Light of wavelength 5000 A falls o n a metal surface of work function 1.9 eV . Find (a ) the energy of photons (b) kinetic energy of photoelectrons . [1eV = 1.6 * 10 (-19) J ] please answer fast

Give any 5 differences between ORBIT ORBITALS

The mass of an electron is 9.1x10

^{-31}kg.If its kinetic energy is 3.0x10^{-25}J.CALCULATE ITS WAVELENGTH........why are bohr's orbits called stationary states?

a) 2pi x

b) 6pi x

c)9x

d)x/3

calculate the mass and charge of one mole of electron?

^{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?Find (a) the total number and (b) the total mass of neutrons in 7 mg of

^{14}C.(Assume that mass of a neutron = 1.675 × 10

^{–27}kg).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?Explain and derive schrodinger wave equation for hydrogen and hydrogen like species.

Calculate the mass of a photon of sodium light having wavelength 5894 A

^{0}& velocity as 310^{8 }ms^{- 1}Calculate energy of one mole of photons

how many nodal planes are there in dz

^{2 }orbital ??? ( most of the authors wrote 2 , bt sme renowned experts wrote ZERO ) so m confused between zero n two ???what are the frequency and wavelenght of a photon emitted during a transition from n=5 state to n=2 state in the hydrogen atom

what is the difference between 2O and O

_{2}How many photons of light having a wavelength 400 nano meter are necessary to provide 1 joule of energy?

DIFFERENCE BETWEEN WAVE AND PARTICLE NATURE? IN BRIEF

What is photoelectric effect?

calculate the no. of protons in 10g of CaCO

_{3}. N_{A}=6.02* 10^{23.}correct set of quantum number for unpaire electron in chlorine

Two particles A and B are in motion. If the wavelength associated with particle A is 5x10^-8m, calculate wavelength associated with B if its momentum is half of A

The kinetic energy of a subatomic particle is 5.85x10^-25 J. Calculate the frequency of the particular wave.

What is black body radiation?A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate

the number of photons emitted per second by the bulb.What are planck's postulates..??

Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in kJ mol

^{–1}.a) 20 x 10

^{14}Hzb) 10 x 10

^{14}Hzc) 5 x 10

^{14 }Hzd) 1 x 10

^{14}Hzwhat is the difference between absorption and emission spectrum

calculate the wavelength , frequency nd wavenumber of a light wave whose period is 2.0 x 10

^{-10}