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Question
Arrange the following elements in order of their decreasing metallic character.
Na, Si, Cl, Mg, Al
Options
Cl > Si > Al > Mg > Na
Na > Mg > Al > Si > Cl
Na > Al > Mg > Cl > Si
Al > Na > Si > Ca > Mg
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Solution
Na > Mg > Al > Si > Cl
Explanation:
Metallic character refers to the tendency of an element to lose electrons. In the periodic table:
- 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.
- All the given elements (Na, Mg, Al, Si, Cl) belong to Period 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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