According to the quantum mechanics, correct statements concerning the electron in the hydrogen atom include which of the following?
$I$ . It moves in a definite orbit around the nucleus.
$I I$ . It is associated with definite energy levels.
$I I I$ . It occupies a fixed position in space with reference to the nucleus

I

only

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I I

only

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I

and

I I I

only

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I I

and

I I I

only

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I, I I

and

I I I

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Solution

The correct option is A $I I$ only
The branch of mechanics that deals with the mathematical description of the motion and interaction of subatomic particles, incorporating the concepts of quantization of energy, wave–particle duality, the uncertainty principle, and the correspondence principle is known as quantum mechanics.

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