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State and explain Pauli’s exclusion principle. |
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Answer» Pauli’s exclusion principle states that “No two electrons in an atom can have the same set of values of all four quantum numbers”. Illustration: H(Z = 1) 1s1 . One electron is present in hydrogen atom, the four quantum numbers are n = 1, l = 0, m = 0 and s = + 1/2. For helium Z = 2. He: 1s2. In this one electron has the quantum number same as that of hydrogen, n = 1,l = 0, m = 0 and s = + 1/2 For other electron, fourth quantum number is different, i.e. n = 1, l = 0, m = 0 and s = – 1/2 . |
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