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13 April, 16:10

Which of the following quantum number combinations is not allowed in an atom?

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  1. 13 April, 16:13
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    N is a positive integer: 1, 2, 3, etc.

    l ranges from 0 to n-1. It can't be equal to n or greater.

    m (sometimes called m_l) the magnetic quantum number ranges from - l to + l.

    The spin can only be + - 1/2
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