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what are

ISOELECTRONIC SPECIESand give examples.Why is Fe

^{3+ }ion more stable than Fe^{2+}ion?what does bombarding means??

drawbacks of j j thomson atomic models

1. 3

2. 4

3. 2

4. This type of transition is not possible

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

explain the first model of an atom based on quantisation of energy

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?

^{15}Hz. if one wave has a wavelength of 2000A^{o}. find possible wavelength values of other wavecalculate mass of photon with wavelength 3.6 A

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

b)A 200 WATT BULB EMITS MONOCHROMATIC LIGHT OF WAVELENGTH 500nm. Calculate the no.of photons emitted per second by the bulb. (3 marks)

ratio of e/m of electron and alpha particle is

(A) K+, Cl-

(B) Na+, Cl-

(C) Na, Ar

(D)Na+, Ar

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.

Solve this :8. Kinetic energy of electron in a mono electronic species is 312 KJ/mole. Then which of the following statements are correct.

(a) The electron is present in 2

^{nd}orbit of He^{+}ion.(b) The electron is present in the 2

^{nd}orbit of H- atom(c) The electron is present in the 3

^{rd}orbit of Li^{+2}in .(d) The electron is present in the fourth orbit of He

^{+}ion.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}4.Calculate the wavelength of radiation, which excites the electron of hydrogen atom from ground state to fourth energy level. Ionization energy of hydrogen atom is 1312 kJ / mol.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?

Calculate the wave number for the shortest wavelength transition in the lyman series of atomic hydrogen. (Rydberg constant=109677 /cm)

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

^{rd}orbit of He^{+}is V. The velocity of electron moving in 2^{nd}orbit of Li^{+2}isi) 9/4 v

ii) 4/9 v

iii) v

iv) None of these

Give any 5 differences between ORBIT ORBITALS

Which of the following orbitals are not possible?

7s , 2d , 3f and 1p

experts please also give explanation so that i could understand about the possibilities of the orbitals...

The mass of an electron is 9.1x10

^{-31}kg.If its kinetic energy is 3.0x10^{-25}J.CALCULATE ITS WAVELENGTH........Ans= 5.4

why are bohr's orbits called stationary states?

a) 2pi x

b) 6pi x

c)9x

d)x/3

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?

calculate the mass and charge of one mole of electron?

1/5800*10

^{-10}m^{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).i) 4 to 1 in H

ii) 5 to 1 in He

^{+}iii) 6 to 1 in Li

^{+2}iv) 6 to 1 in Be

^{+3}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 energy difference between two electronic states of hydrogen atom is 245.9 kJ mol

^{-1}. Calculate the wavelength of light emitted when an electron drops from the higher to the lower state. (plank's constant, h=3.99. 10^{-13}kJ.Sec.mol^{-1)}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 ???the wavelength of blue light is 480 nm. Calculate the frequency & wave number of this light.

A)Gama line in Lyman series in H--UV

B)Beta line in Balmer series in He

^{+}---UVC)Delta line in Balmer series in H---visisble

D)Delta line in Paschen series in H--- Infrared

Answer is all the options are correct but I don't understand how B is correct. Also explain the others. How can a beta line in Balmer series in He+ is UV. How do I know if it will be UV. It must be visible?

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

^{-1}. find out itswhat is the difference between 2O and O

_{2}The electron configuration, 1s

^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{9}, represents aa)Metal atom

b)Non-metal atom

c)Non-metallic anoin

d)Metallic cation

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

The no. Of electrons in 2gm ion of nitrate NO3 is ?

DIFFERENCE BETWEEN WAVE AND PARTICLE NATURE? IN BRIEF

Which is more electronegative SO

_{3}or SO_{2}, and why?What is photoelectric effect?

calculate the no. of protons in 10g of CaCO

_{3}. N_{A}=6.02* 10^{23.}Which quantum number determines (i) energy of electron(ii) Orientation oforbitals.

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

a)its electronic configuration is 3d

^{5}4s1b)tot. spin of Cr. =3

c)spin multiplicity of 3-d -subshell ofCr

d) magntic moment of Cr = 48

^{1/2}The kinetic energy of a subatomic particle is 5.85x10^-25 J. Calculate the frequency of the particular wave.

Q.17. A photon in X region is more energetic than in the visible region; X is

(a) IR

(b) UV

(c) Microwave

(d) Radio 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..??

electronic configuration of 30 elements of hund's priciple

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

^{–1}.can anyone tell me the meaning of symmetrical distribution of electron..??

a) 20 x 10

^{14}Hzb) 10 x 10

^{14}Hzc) 5 x 10

^{14 }Hzd) 1 x 10

^{14}Hz_{x2}_{- y2}_{z2}_{xy}_{}2p_{z}what is the difference between absorption and emission spectrum

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

^{-10}the symbol (sie) in schrodinger equation is what ??? is it the amplitude or wave function ??