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Syllabus

what are

ISOELECTRONIC SPECIESand give examples.a) Which property of matter is revealed in the above statement? (1)

b) A photon has a mass of 8.6 x10-30 kg. Calculate its wavelength. (Planck’s constant = 6.626 x 10-34 Js

Why is Fe

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

Find out atomic no., mass no., no. of electron and neutron in an element 20X40?

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.

_{e}=9.11x10^{-31}Kgexplain pauli's exclusion principle

What'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..!

URGENT:An electron has a velocity of 300 m s

^{-1}that is accurate to 0.01%. With what accuracy can one locate the position of this electron ( mass of electron = 9.1 * 10^{-31}kg )?Why is electron gain enthalpy of chlorine is more than fluorine?

calculate mass of photon with wavelength 3.6 A

^{.}?i didn't understand the intensity versus wavelength graph in the topic black body radiation.It shows that initially intensity is increasing with increase of wavelength while theory says that it increases with decrease of wavelength........would you please explain me?

why electon cannot exist in the nucleus?

The red spectral line of lithium occurs at 671nm. Calculate the energy of one photon of this light?

ratio of e/m of electron and alpha particle is

position is of the order of 1.2 A0.

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

what does bombarding means??

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}= (4Ï€Îµ_{0})n^{2}h^{2 }/ 4Ï€^{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

The concentration of photons in a uniform light beam with a wavelength of 500nm is 1.7 * 10

^{13}/ m^{3 }. The intensity of the beam is in W / m^{2}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?

An element has electronic configuration [Ar] 3d4 in its +3 oxidation state.What will be the electronic configuration of its atom?

state Heisenberg's Uncertainty principle?

"The stability of an multi electron atom is because total attractive interaction are more than repulsive interaction. In general the repulsive interaction of the electron in the outershell with the electron in inner shell are more important." -NCERT. Why the repulsive interaction of the electron in the outershell with the electron in inner shell are more important ?

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

when electron jumps from 5th to 1st energy level,to which series the spectral line belongs?

The mass of an electron is 9.1x10

^{-31}kg.If its kinetic energy is 3.0x10^{-25}J.CALCULATE ITS WAVELENGTH........what is shape of d-Orbital designated as d

_{xy }d_{yz}d_{xz}d_{x2-y2}d_{z2}why are bohr's orbits called stationary states?

which is the first energy level containing f orbital

a) 2pi x

b) 6pi x

c)9x

d)x/3

The angular momentum of an electron is zero. In which orbital may it be present.

a) 2s

b)2p

3)3d

4)4f

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?^{14}sec^{-1}.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?the symbol (sie) in schrodinger equation is what ??? is it the amplitude or wave function ??Explain and derive schrodinger wave equation for hydrogen and hydrogen like species.

write electronic configuration of Cr+ ion?

how many orbitals are there in above ion?

how many no. of unpaired electrons in Cr+ion?

wht is the magnetic behaviour ?

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

^{0}& velocity as 310^{8 }ms^{- 1}the wavelength of the third line in the Paschen series of hydrogen spectra spectra is ?

In this type of question n1=3 but from where n2 =6 come it is not given

tell me how to solve numerical based on line in other spectral series of hydrogen too

Calculate energy of one mole of photons

plz help me in these questions

1.

_{6}C^{12 }and_{5}B^{11 }are called2.Which formula represents the K.E. of an electron in n

^{th }bohr's orbitof H-atom3.the enregy of electron in excited H-atom is -3.4eV. What is the angular momentum of electron of electron?

4.What is the frequency of electron in an orbit of radius r,if it's velocity is v ?

5.The angular momentum of electron in bohr's orbit is J.what will be the K.E, of the bohr's orbit ?

6.The excitation of an electron for second orbit to third orbit of an on atom with with +Ze nuclear charge is 47.2eV.if the energy of hydrogen atomin lowest state is -13.6eV. what will be the value of Z.

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 ???why energies of the orbitals in the same subshell decrease with increase in the atomic number(Zeff)?

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}Why The Shells are named as KLMN Why not ABCD Or Something else???

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

_{2}_{}.{PLEASE VERY URGENT}DIFFERENCE BETWEEN WAVE AND PARTICLE NATURE? IN BRIEF

What is photoelectric effect?

electronic configuration of 30 elements of hund's priciple

calculate the no. of protons in 10g of CaCO

_{3}. N_{A}=6.02* 10^{23.}^{15}s^{-1}.What transition is responsible for this spherical line.correct set of quantum number for unpaire electron in chlorine

^{-7}m is observed in the emission spectrum of hydrogen. Calculate the energy of one photon of this green light (HHW)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.

why is the cathode ray tube attached to a vacuum pump?

What is black body radiation?natural abundance of C

^{12 }and C^{13 }isotopes of carbon are 99% and 1% respectively.assuming they only contribute to the molar weight of C_{2}F_{4},what is the percentage of C_{2}F_{4}having molar mass 101?A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate

the number of photons emitted per second by the bulb.calculate the excitation energy required for the promotion of electron from the ground state of hydrogen to the fourth energy level.

What are planck's postulates..??

what experimental support is available for de-broglie's concept?

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

Q4. The distance of closest approach of an $\alpha $–particle fired towards a nucleus with momentum p is r. What will be the distance of closest approach when the momentum of the $\alpha $–particle is 2p?

(A) 2r (B) 4r (C) r/2 (D) r/4 Plz answer this

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

^{-10}what are magic numbers? Are they 2,8,8,18,18,32 or 2,8,20,50,82,126 ?