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The size of nucleus is
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The orbitals with maximum number of possible orientation is:
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The number of unpaired electrons in fluorine atoms is/are
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A dipositive ion has in the K shell, 8 e~ s in the L shell and in the M shell. Atomic number of Z is
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If value of h is taken as , the de-Broglie wavelength of a particle of mass having velocity is
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The charge on an atom of is
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The velocity of a photon is
A. dependent on its wavelength
B. dependent on its source
C. equal to cube of its amplitude
D. independent of its wavelength
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Charge on an electron was shown by
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The number of neutrons in the deuterium atom is
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In an atom of hydrogen, which of the following orbitais has the lowest energy for an electron present in it?
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The atomic structure of an atom of an element is Is . The element is
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Mass of positron is the same to that of
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The number of neutrons present in are
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Which of the following has the highest mass?
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Which elements is represented by the following electronic configuration?
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The maximum number of electrons in a sub-energy level is equal to
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In the nucleus of there are
A. 40 protons and 20 electrons
B. 20 protons and 40 electrons
C. 20 protons and 40 neutrons
D. 20 protons and 20 neutrons
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4
The correct set of quantum numbers for the impaired electron of fluorine atom is
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When the electron is excited from K level to M level we get
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The number of unpaired electrons in the ground state of chromium is
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The wavelength of an electron
A. is equal to that of light
B. remains constant with velocity
C. decreases with an increasing velocity
D. increases with an decreasing velocity
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The angular momentum of the moving electron is equal to
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In Lyman series an electron jumps from higher energy level to
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The relationship between energy of a radiation and its frequency was given by
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The maximum number of electrons that can be accommodated by an atom in g-sub-energy level are
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4
Bohr's concept of the orbit in an atom was contradicted by
A. de Broglie relationship
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The ion that is isoelectronic with CO is
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The exchange of particles considered responsible for keeping the nucleons together are
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Wave number is defined as
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rays are a stream of