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Atomic Number

The number wh...

Question

The number which identify the state of an electron, specify the energy and its location around the nucleus are called __________.

A

Quantum numbers

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B

Atomic number

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C

Mass number

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D

Constant number

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Solution

The correct option is A Quantum numbers
The number which identify the state of an electron, specify the energy and its location around the nucleus are called quantum numbers.
Each electron in an atom is described by four different quantum numbers. The first three $(n, l, m_{l})$ specify the particular orbital of interest, and the fourth $(m_{s})$ specifies how many electrons can occupy that orbital.

Principal quantum number specifies the energy of an electron and the size of the orbital.

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Q. Assertion :Energy of electron is largely determined by its principal quantum number. Reason: Principal quantum number is a measure of the most possible distance of finding the electron around the nucleus.

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(d) Electrons move around the nucleus in specified circular paths called orbits or shells or energy levels and are designated as K, L, M, N shells respectively.

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