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what are

ISOELECTRONIC SPECIESand give examples.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}Why is Fe

^{3+ }ion more stable than Fe^{2+}ion?What will be the maximum value of (n + l + m) for all the unpaired electrons of chlorine in its second excited state?

drawbacks of j j thomson atomic models

^{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.

explain pauli's exclusion principle

_{e}=9.11x10^{-31}Kgcalculate the mass and charge of one mole of electron?

What'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?

_{y}orbital:a) total no of nodes are 2

b) number of maxima in the curve 4pir

^{2}R^{2}(r) Vs r is twoc) quantum number n, l and m for orbital be 3 , 1 and -1 respectively

d) the magnetic quantum number may have a positive value

answer it with explanation please...dont send any link....

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

Pls give the answer in steps..!

calculate mass of photon with wavelength 3.6 A

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

[charge on particle=4e

^{- }, m_{particle }= (1/2) m_{electron}]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.

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

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

unpaired electrons in each case.

^{x+}(atomic number M=25) is root of 15 Bohr Magneton. The number of unpaired electrons and the value of X respectively are? Also please explain Magnetic Moment?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

a) 9,1

b)10,1

c) 10,2

d) 4,-4

Could you please explain what's spin multiplicity?

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

Calculate the wave number of the spectral lines of shortest wave length appearing in the balmer series of hydrogen spectrum. given , R=1.09 * 10 to the power of 7 m-1.

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?

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?Give any 5 differences between ORBIT ORBITALS

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

The mass of an electron is 9.1x10

^{-31}kg.If its kinetic energy is 3.0x10^{-25}J.CALCULATE ITS WAVELENGTH........^{+}to the second state of hydrogen isa. 32/27

b.27/32

c.1/54

d.27/2

a) 2pi x

b) 6pi x

c)9x

d)x/3

why are bohr's orbits called stationary states?

what are the number of waves made by an electron in the fifth bohr orbital???

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).Explain and derive schrodinger wave equation for hydrogen and hydrogen like species.

How are dxy and dx

^{2}y^{2}related?Calculate the mass of a photon of sodium light having wavelength 5894 A

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

9. The electron gain enthalpy of chlorine is -349 kJ mol

^{-1}. How much energy in kJ is released when 3.55g of chlorine is converted completely into Cl^{-}ion in the gaseous state?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

_{H }= 1.09678 x 10^{7}m^{-1]}RH=109678cm−1E1=-13.6eV , E2= -3.4eV, E3=-1.5eV ,E4=-0.85eV ,E5=-0.54eV

what is the difference between 2O and O

_{2}DIFFERENCE BETWEEN WAVE AND PARTICLE NATURE? IN BRIEF

Calculate the de Broglie wavelength of CO

_{2}moving with a velocity of 440m/s.What is photoelectric effect?

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

_{y}_{z}2_{x}^{2}– y^{2}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

Q. Spin magnetic moment of ${x}^{n+}\left(Z=26\right)is\sqrt{24}B.M.$ . Hence number of upaired electrons and value of n respectively are

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

what is the maximum number of electrons which can be accommodated in an atom in which the highest principal quantum number values is 4?

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

red light has wavelength 750nm whereas violet light has wavelength 400nm.

Calculate therir frequncy and energy.

(c=3x10

^{8}ms^{-1}, h=6.63x10^{-34}What is black body radiation?if the wavelenght of thefirst line of the balmer series is 6500A.then calculate the wavelenght of second line of the balmer series .i have already asked this question .but my doubt has not been clarified .could u please explain in clear steps ...

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}.what is the difference between absorption and emission spectrum

a) 20 x 10

^{14}Hzb) 10 x 10

^{14}Hzc) 5 x 10

^{14 }Hzd) 1 x 10

^{14}Hzwhich is the first energy level containing f orbital

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

^{-10}$A)2\to 1:3\to 1\phantom{\rule{0ex}{0ex}}B)2\to 1,4\to 3\phantom{\rule{0ex}{0ex}}C)2\to 1,5\to 4\phantom{\rule{0ex}{0ex}}D)2\to 1,4\to 1$