Arrange the following elements in order of their decreasing metallic character. Na, Si, Cl, Mg, Al

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Na > Mg > Al > Si > Cl Explanation: Metallic character refers to the tendency of an element to lose electrons. In the periodic table: 1. Across a period (from left to right), metallic character decreases because the atomic size decreases and the effective nuclear charge increases, making it harder to lose electrons. 2. All the given elements (Na, Mg, Al, Si, Cl) belong to Period 3. 3. Arranging them from left to right in Period 3 gives the order of decreasing metallic character: Sodium (Na) > Magnesium (Mg) > Aluminium (Al) > Silicon (Si) > Chlorine (Cl).

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