The number of spin orientations possible for an electron in an orbital is ______.

five

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two

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four

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three

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Solution

The correct option is B two
Spin quantum number $(m_{s})$ refers to the possible orientations of an electron in an orbital. It gives two possible orientations.

One is clockwise spin $(+ \frac{1}{2})$ which is represented by $↿$ and other is anti-clock wise spin $(- \frac{1}{2})$ which is represented by $⇂$ .

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Question 21

Which of the following statements concerning the quantum numbers are correct ?

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(b) The principal quantum number determines the orientation and energy of the orbital

(d). Spin quantum number of an electron determines the orientation of the spin of electron relative to the chosen axis.

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