<P> In chemistry, an electron pair or a Lewis pair consists of two electrons that occupy the same molecular orbital but have opposite spins . The electron pair concept was introduced in a 1916 paper of Gilbert N. Lewis . </P> <P> Because electrons are fermions, the Pauli exclusion principle forbids these particles from having exactly the same quantum numbers . Therefore, the only way to occupy the same orbital, i.e. have the same orbital quantum numbers, is to differ in the spin quantum number . This limits the number of electrons in the same orbital to exactly two . </P>

What is meant by the term paired electrons
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