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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

the 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

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.

the uncertainty in the momentum delta p of a football thrown by Tom Brady during the superbowl travelling at 40m/s is 1x10 raised-6 of its momentum.what is the its in the position delta x mass =0.40kg

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

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

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..!

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?

uncertainty in its position. (Planck’s constant, h = 6.626 x 10-34 Js. Mass of the electron = 9.1 x 10-31 kg).

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

can anyone tell me the meaning of symmetrical distribution of electron..??

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.

Al

Ga

Boron

all of these

ans is given 4th option but according to ncert boron does not react with acid and alkalies at any temperature ,.so pls give correct ans.

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

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

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

Is it possible to have the configuration 1s3?

state Heisenberg's Uncertainty principle?

position is of the order of 1.2 A0.

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

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

Give any 5 differences between ORBIT ORBITALS

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?

The mass of an electron is 9.1x10

^{-31}kg.If its kinetic energy is 3.0x10^{-25}J.CALCULATE ITS WAVELENGTH........(A) K+, Cl-

(B) Na+, Cl-

(C) Na, Ar

(D)Na+, Ar

why are bohr's orbits called stationary states?

It may not be possible to measure/determine position and velocity of an electron simultaneously, but practically an electron can have definite position and velocity then why it is stated as Bohr's model failure / drawback.

a) 2pi x

b) 6pi x

c)9x

d)x/3

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

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?In tabular form plzzzz

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}Which quantum number determines (i) energy of electron(ii) Orientation oforbitals.

Calculate energy of one mole of photons

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

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 symbol (sie) in schrodinger equation is what ??? is it the amplitude or wave function ??1) Explain what is meant by exceptional stability of an atom? Why are some elements like copper are exceptionally stable?

2) How can you say that when there is a positive sign on any element, it looses an electon and when there is negative sign on any element, it gains an electron?

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

why copper and chromium have extra stability?

what is the difference between 2O and O

_{2}What are the postulates of the Dalton's atomic theory ?

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

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 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

_{2}_{}.{PLEASE VERY URGENT}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) 4.8$\times {10}^{-19}C$

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

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

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

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..??

Lead is not known to form an iodide. PbI

_{4}. Give reasonElectromagnetic 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 lowest value of 'n' that allows 'f' orbitals to exist?

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

can a thin foil of aluminium be used in place of gold in rutherford experiment? give suitable explanation.

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

^{-10}