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Questions asked by swapnarajan1982
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125
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answers selected
An atom of beryllium consists of 4 protons, 5 neutrons, and 4 electrons. The mass number of this atom is
sat
chemistry
atomic-structure
asked
Jul 19, 2018
1
answer
A light paddle wheel moves when placed in the way of cathode rays. This shows the property of cathode rays that :
sat
chemistry
atomic-structure
asked
Jul 19, 2018
1
answer
The conditions necessary for production of cathode rays are :
sat
chemistry
atomic-structure
asked
Jul 19, 2018
1
answer
Which of the following statements is incorrect :
sat
chemistry
atomic-structure
asked
Jul 19, 2018
1
answer
The discovery of neutron became very late because ::
sat
chemistry
atomic-structure
asked
Jul 19, 2018
1
answer
Give the name and atomic number of the inert gas atom in which the total number of d-electrons is equal to the difference between the numbers of total p and total s electrons.
sat
chemistry
atomic-structure
asked
Jul 19, 2018
1
answer
Find energy of each of the photons which correspond to light of frequency $3\times 10^{15}Hz$.
sat
chemistry
atomic-structure
cbse
class11
ch2
structure-of-atom
asked
Jul 19, 2018
1
answer
Calculate the number of electrons which will together weigh one gram.
sat
chemistry
atomic-structure
asked
Jul 19, 2018
1
answer
Using s,p,d and f notation, describe the orbital with the quantum numbers- (a) n=1,l=0
sat
chemistry
atomic-structure
asked
Jul 19, 2018
1
answer
Calculate wave number of yellow radiations having wavelength of 5800 A0 .
sat
chemistry
atomic-structure
asked
Jul 19, 2018
1
answer
Calculate the accelerating potential that must be applied to a proton beam to give it an effective wavelength of 0.005 nm.
sat
chemistry
atomic-structure
asked
Jul 19, 2018
1
answer
If number of electrons of $^{37}X^-$ and $_{20}Y^{+2}$ are equal; find number of neutrons of $^{37}X^-$.
sat
chemistry
atomic-structure
asked
Jul 18, 2018
1
answer
Which one of the following statements are always true for neutral atoms
sat
chemistry
atomic-structure
asked
Jul 18, 2018
1
answer
A 1 MeV proton is sent against a gold leaf (Z = 79). Calculate the distance of closest approach for head on collision.
sat
chemistry
atomic-structure
asked
Jul 18, 2018
1
answer
Calculate the ratio of K.E and P.E of an electron in an orbit?
sat
chemistry
atomic-structure
asked
Jul 18, 2018
1
answer
An orbital may never be occupied by
sat
chemistry
atomic-structure
asked
Jul 17, 2018
1
answer
The sublevel that can be occupied by a maximum of 10 electrons is identified by the letter
sat
chemistry
atomic-structure
asked
Jul 17, 2018
1
answer
The sublevel that has only one orbital is identified by the letter
sat
chemistry
atomic-structure
asked
Jul 17, 2018
1
answer
The lowest principal quantum number that an electron can have is
sat
chemistry
atomic-structure
asked
Jul 17, 2018
1
answer
The two main regions of an atom are the
sat
chemistry
atomic-structure
asked
Jul 17, 2018
1
answer
Discovery of the nucleus of an atom was due to the experiment carried out by
sat
chemistry
atomic-structure
asked
Jul 17, 2018
1
answer
The ratio of the energy of a photon of 2000A wavelength radiation to that of 4000A radiation is
sat
chemistry
atomic-structure
asked
Jul 17, 2018
1
answer
Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of ${_6}C^{12}$
sat
chemistry
atomic-structure
cbse
class11
ch2
structure-of-atom
asked
Jul 17, 2018
1
answer
What is the wavelength associated with 150 eV electron
sat
chemistry
atomic-structure
asked
Jul 17, 2018
2
answers
Calculate the de Broglie wavelength of an electron moving with a velocity of $5.0\times10^5ms^{–1}$
sat
chemistry
atomic-structure
asked
Jul 17, 2018
1
answer
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