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How many electrons in a given atom can h...

How many electrons in a given atom can have the following quantum numbers ?
`(a) n = 3, l = 1 (b) n = 3, l = 2, m_l = 0 (c ) n = 3, l = 2, m_l = +2, m_s = + 1/2 (d) n = 3`.

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The correct Answer is:
(a) 6 (b) 2 (c ) 1 (d) 18
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