❓ Question
Considering the atomic number and position in the periodic table, arrange the following elements in the increasing order of metallic character: Si, Be, Mg, Na, P.
✅ Step-by-Step Solution
- Concept Recall
- Metallic character refers to the tendency of an element to lose electrons and form positive ions (electropositive nature).
- Periodic Trend:
- Metallic character increases down a group (due to larger atomic size and lower ionization energy).
- Metallic character decreases across a period from left to right (due to smaller atomic size and higher ionization energy).
- Element Positions
- P (Phosphorus) → Group 15, Period 3 → Non-metal.
- Si (Silicon) → Group 14, Period 3 → Metalloid (less metallic than Be or Mg).
- Be (Beryllium) → Group 2, Period 2 → Alkaline earth metal (least metallic in Group 2).
- Mg (Magnesium) → Group 2, Period 3 → Alkaline earth metal (more metallic than Be).
- Na (Sodium) → Group 1, Period 3 → Alkali metal (highly metallic).
- Arranging by Metallic Character
- Least metallic → P (non-metal)
- Then → Si (metalloid)
- Then → Be (metal, but small size, low metallic nature among Group 2)
- Then → Mg (more metallic than Be)
- Most metallic → Na (alkali metal)
🔑 Final Order of Increasing Metallic Character
P < Si < Be < Mg < Na
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