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what are ISOELECTRONIC SPECIES and give examples.
Why is Fe3+ ion more stable than Fe2+ ion?
drawbacks of j j thomson atomic models
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
Lead is not known to form an iodide. PbI4. Give reason
What's is hunds rule of maximum multiplicity Explain with many example and how is it different from the other
How many electrons in sulphur ( Z = 16 ) can have n + l = 3 ?
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 de broglie wavelength of an electron and a proton having same kinetic energy of 100 eV
calculate mass of photon with wavelength 3.6 A . ?
why are bohr's orbits called stationary states?
why electon cannot exist in the nucleus?
what is the limitations of de broglie's equation?
ratio of e/m of electron and alpha particle is
Q.) Which transition of Li2+ 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
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 )?
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 nth orbit in bohr's model?
the formula is Rn = (4πε0)n2h2 / 4π2me2
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?
How do dx2-dy2 and dxy orbitals differ in their orientation in space?
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
Give any 5 differences between ORBIT ORBITALS
The mass of an electron is 9.1x10-31kg.If its kinetic energy is 3.0x10-25J.CALCULATE ITS WAVELENGTH........
difference between notation of 'l' and 'L'.
calculate the mass and charge of one mole of electron?
how many nodes are present in 4 d orbital
Find (a) the total number and (b) the total mass of neutrons in 7 mg of 14C.
(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?
calculate the energy and frequency of light required to excite an electron in hydrogen atom from first energy level to fourth energy level
Explain and derive schrodinger wave equation for hydrogen and hydrogen like species.
Calculate the mass of a photon of sodium light having wavelength 5894 A0 & velocity as 3108 ms - 1
Calculate energy of one mole of photons
how many nodal planes are there in dz2 orbital ??? ( most of the authors wrote 2 , bt sme renowned experts wrote ZERO ) so m confused between zero n two ???
The kinetic energy of an electron has been found to be 5.76*10^-15J.Calculate the wavelength
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
How do d x2 - y2 and d xy orbital's differ in their orientation in space?
what is the difference between 2O and O2
DIFFERENCE BETWEEN WAVE AND PARTICLE NATURE? IN BRIEF
What is photoelectric effect?
How many photons of light having a wavelength 400 nano meter are necessary to provide 1 joule of energy?
calculate the no. of protons in 10g of CaCO3 . NA=6.02* 1023.
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
Calculate the minimum amount of energy that the photon must carry in order to eject an electron from caesium metal. The threshold frequency of caesium is 4.6X10 raised to power 14 Hz.
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
What are planck's postulates..??
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?
Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in kJ mol–1.
the first emission line in the atomic spectrum of hydrogen in the balmer series appears at-
1. 5R/36 /cm 2.3R/4/cm 3.7R/144/cm 4.9R/400/cm
what is the difference between absorption and emission spectrum
calculate the wavelength , frequency nd wavenumber of a light wave whose period is 2.0 x 10-10
why is hunds rule called the rule of maximum multiplicity????
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