Sodium is more reactive than aluminium.
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(1) If the number of electrons in the outermost orbit of an atom of a metal is less, the metal is more reactive. ... The number of electrons in the outermost orbit of sodium and aluminium atoms are 1 and 3, respectively. Hence, sodium is more reactive than aluminium.
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If the number of electrons in the outermost orbit of an atom of a metal is less, the metal is more reactive.
(2) Sodium has electronic configuration
(2, 8, 1) and aluminium has electronic configuration (2, 8, 3). The number of electrons in the outermost orbit of sodium and aluminium atoms are 1 and 3, respectively. Hence, sodium is more reactive than aluminium.
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