The maximum number of electrons that can have principal quantum number, n = 3, and spin quantum number, ms = $-\dfrac{1}{2}$, is

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The maximum number of electrons that can have principal quantum number, n = 3, and spin quantum number, m_s = $-\dfrac{1}{2}$, is

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The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is

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