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what are

ISOELECTRONIC SPECIESand give examples.in the rutherford scattering experiment source of alpha particles is simply shown as a box. i want to know is there any type of experimental setup in the box or not? explain

why were alpha particles passes through a disc of lead.?

Why is Fe

^{3+ }ion more stable than Fe^{2+}ion?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?drawbacks of j j thomson atomic models

1.write the value of 'n' and 'l' for its electron in the valence shell?

2.how many unpaired electrons are present in it?

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.

Is it possible to have the configuration 1s3?

explain pauli's exclusion principle

29. a) For the element with atomic number 24

i) Write the electronic configuration.

ii)Write the value of 'n' and 'I' for its electron in the value shell.

iii) How many unpaired electrons are present in it?

b) State Pauli's exclusion principle. Is it possible to have configuration ls

^{3}?30. a) Write any two demerits of Bohr's atomic model.

b) Name the quantum number that specifies

i) size of an orbital

ii) shape of an orbital

c) Write the equation which gives relation between wav

($\mathrm{\lambda}$) and momentum (p) of a material particle.

_{e}=9.11x10^{-31}KgPlease answer it fast experts...

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..!

Q. State and explain Pauli's exclusion principle and Hund's rule of maximum multiplicity. Why are half-filled and fully filled electronic configurations more stable over the other configurations?

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

calculate mass of photon with wavelength 3.6 A

^{.}?What is the lowest value of 'n' that allows 'f' orbitals to exist?

why electon cannot exist in the nucleus?

ratio of e/m of electron and alpha particle is

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?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

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 the wave number for the longest wavelength transition in the Balmer series of atomic hydrogen.

_{y}_{z}2_{x}^{2}– y^{2}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}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

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

a) 2s

b)2p

3)3d

4)4f

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

_{2}H_{2}with orbital diagramWhy do half filled and completely filled orbitals have extra stability?

(A) $\alpha $-particle

(B) proton

(C) deutron

(D) neutron

state Heisenberg's Uncertainty principle?

Calculate the energy and wavelength of photon emitted by hydrogen atom when electron makes an transition from n=2 to n=1.Given that the ionisation of potential is 13.6eV.(1eV=1.6 x 10 raised to power -19 J)

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

Give any 5 differences between ORBIT ORBITALS

A microscope using suitable photons is employed to locate an electron in an atom within a distance of 0.1A, what is the uncertainity involved in the measurement of its velocity?

The mass of an electron is 9.1x10

^{-31}kg.If its kinetic energy is 3.0x10^{-25}J.CALCULATE ITS WAVELENGTH........How do d

^{x2 }-^{y2}and d xy orbital's differ in their orientation in space?why are bohr's orbits called stationary states?

An electron has a speed of 600m/s with uncertainity of 0.025%. What is the uncertainity in locating its position ?

a) 2pi x

b) 6pi x

c)9x

d)x/3

calculate the mass and charge of one mole of electron?

Which rule will be disobeyed by the electronic configurations:

(i) 2s

^{3}(ii) 2s^{2}2px^{2}2py^{1}2p^{0}^{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?Q.3. The ionisation energy of a hydrogen atom is 13.6 ev. The energy of the ground level in doubly ionised lithium is

(1) - 28.7 ev

(2) - 54.4 ev

(3) - 122.4 ev

(4) - 13.6 ev

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 the meaning of the symbol 4d^{6}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?^{3+}(z=27)compare its para magnetism with Cr^{3+}(z=24)fe^{3+}(z=26)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}uncertainty in its position. (Planck’s constant, h = 6.626 x 10-34 Js. Mass of the electron = 9.1 x 10-31 kg).

Calculate energy of one mole of photons

The heaviest particle is ______?

a) Electron b) Proton c) Positron d) Neutron e) Meson

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?

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

what is the difference between 2O and O

_{2}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

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

A standing wave in a string 35cm long has a total of six nodes including those at the ends hence wavelength of standing waves is_________

a. 5:8 c.1:4

b.10:4 d:4:6

please kindly give the answer,

What is photoelectric effect?

calculate the no. of protons in 10g of CaCO

_{3}. N_{A}=6.02* 10^{23.}^{12 }Hzcorrect set of quantum number for unpaire electron in chlorine

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 ?

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

How many electrons have clockwise spin in a fully filled 4f sub shell and 3rd main shell?

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

What is black body radiation?Armstrong. Calculate the no. of photons emitted by the bulb per minute.

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

the number of photons emitted per second by the bulb.WHY THOMSON ATOMIC MODEL WAS FAILED?

WHAT ARE THE DRAW BACKS OF RUTHERFORD'S ATOMIC MODEL?

What are planck's postulates..??

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

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

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

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

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

^{–1}.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

A gas of identical hydrogen-like atoms has some atoms in the lowest (ground) energy level A and some atoms in a particular upper (excited) energy level B and there are no atoms in any other energy level. The atoms of the gas make the transition to a higher energy level by absorbing monochromatic light of photon energy 2.7eV. Subsequently, the atoms emit radiation of only six different photons more energies. Some of the emitted photons have energy of 2.7eV, some have more energy and some less than 2.7ev.calculate the wavelength , frequency nd wavenumber of a light wave whose period is 2.0 x 10

^{-10}