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The ratio of potential energy (PE) and total energy of an electron in a Bohr orbit of a hydrogen like atom is

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Important Questions on Atomic Structure

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de Broglie was awarded the Nobel Prize in the year
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Both the position and exact velocity of an electron in an atom can not be determined simultaneously and accurately. This is known as
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The number of regions, where the probability density of electrons is reduced to zero for 3s atomic orbital is
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How many of the following orbitals have two angular and one radial nodes?

3d; 4d; 5f; 3p