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what are

ISOELECTRONIC SPECIESand give examples.1) 2/3

2) 3/2

3) 9/16

4) 16/9

Why is Fe

^{3+ }ion more stable than Fe^{2+}ion?1) 1.01 × 10

^{20}2) 3.03 × 10

^{18}3) 5 × 10

^{19}4) 7 × 10

^{14}drawbacks of j j thomson atomic models

(a) 56 (b) 100 (c) 22 (d) 44

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}Kgthe electronic configuratin of element is 1s2 ,2s2 ,2p6,3s2,3p6,3d5,4s1 .what does this represnt?

rn(1)excited state

rn(2)ground state

rn(3)cationic form

rn(4)anionic form

What's is hunds rule of maximum multiplicity Explain with many example and how is it different from the other

10.The wave number of radiation of wavelength 500 nm is$\left(A\right)5\times {10}^{-7}{m}^{-1}\left(B\right)2\times {10}^{7}{m}^{-1}\left(C\right)2\times {10}^{6}{m}^{-1}\left(D\right)500\times {10}^{-9}{m}^{-1}$

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

Pls give the answer in steps..!

Which quantum number distinguishes the electron present in the same orbital of an atom?A. Azimuthal quantum number

B. Magnetic quantum number

C. Principal quantum number

D. Spin quantum number

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

calculate mass of photon with wavelength 3.6 A

^{.}?draw a diagram of orbital whose magnetic quantum number is 0 , comment on its shape.

why electon cannot exist in the nucleus?

ratio of e/m of electron and alpha particle is

electrons are the basic constituents of all the atoms.how?

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

1/5800*10

^{-10}mCalculate the wave number for the longest wavelength transition in the Balmer series of atomic hydrogen.

How will you show that electrons are negatively charged material particles?????

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

unpaired electrons in each case.

" the oscillating electric and magnetic field produced by the oscillating charged particles are perendicular to each other and also perpendicular to the direction of propogation of wave ". Please explain?

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?

^{2}nm, what is the wavelength of B?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

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

a) 2s

b)2p

3)3d

4)4f

Give any 5 differences between ORBIT ORBITALS

how many electrons in a fully filled f subshell have m = 0Answer is 2. Could you explain answer with details

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?

_{2}_{}.{PLEASE VERY URGENT}a) 2pi x

b) 6pi x

c)9x

d)x/3

(A) 4.8$\times {10}^{-19}C$

(b) 1.6$\times {10}^{-19}C$

(c) 3.2$\times {10}^{-19}C$

(d) 6.4$\times {10}^{-19}C$

calculate the mass and charge of one mole of electron?

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

^{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?what does bombarding means??

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).^{3+}(Z=27) COMPARE ITS PARAMAGNETISM WITH Cr^{3+}(Z=24)Fe(Z=26).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?(A) K+, Cl-

(B) Na+, Cl-

(C) Na, Ar

(D)Na+, Ar

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}_{2}, CS_{2}, CCl_{4}, H_{2}O . No linksCalculate 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 ???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?

^{1}, 3d^{10}and not [Ar] 4s^{2}, 3d^{9}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

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

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?

_{y}_{z}2_{x}^{2}– y^{2}DIFFERENCE BETWEEN WAVE AND PARTICLE NATURE? IN BRIEF

What is photoelectric effect?

Calculate the ratio of wavelength of first and the ultimate line of Balmer series of Li

^{2+}?calculate the no. of protons in 10g of CaCO

_{3}. N_{A}=6.02* 10^{23.}How many electrons have clockwise spin in a fully filled 4f sub shell and 3rd main shell?

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

which is the first energy level containing f orbital

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) n = 3, l = 0, m = 0, s = + 12

(b) n = 3, l = 1, m = 1, s = + 12

(c) n = 3, l = 2, m = 1, s = + 12

(d) n = 4, l = 0, m = 0, s = + 12

A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate

the number of photons emitted per second by the bulb.WHAT IS WORK FUNCTION

What are planck's postulates..??

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

^{–1}.Lower the value of (

n+ l) for an orbital, lower is its energy.When two orbitals have the same value of (

n+ l), the orbital with lower value ofnwill have lower energy.pls explain above two statements with example of n

a) 20 x 10

^{14}Hzb) 10 x 10

^{14}Hzc) 5 x 10

^{14 }Hzd) 1 x 10

^{14}HzWHAT is the no of molecules present in 1 ml of water vapour at STP?? I did like this

1 mole of h2o at STP has 22.4l volume ie...6.022 *10

^{23}molecules has 22.4lSo 1/1000 l will have x molecules

By diving x=o.26 * 10

^{20}.This is wat I got is this correct??help pls...what is the difference between absorption and emission spectrum

dorbital?_{xy }calculate the wavelength , frequency nd wavenumber of a light wave whose period is 2.0 x 10

^{-10}show graphically the variation of probability density with the distance from nucleus for 2s orbital?