In Bohr’s model of hydrogen atom, which of the following pairs of quantities are quantized?
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According to Bohr's theory of the 
atom, electrons can revolve only in those orbits in which their angular momentum is an integral multiple of 
, where 
is
Plank's constant.
Angular momentum 
Hence, angular momentum is quantized.
The energy of an electron in 
orbit of the hydrogen atom,
Thus, it is obvious that the hydrogen atom has some characteristics of energy state. In fact, this is true for the atom of each element, 
, each atom has its energy quantized.
Hence, both energy and angular momentum are quantized.
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