Considering atomic number and position in periodic table, arrange elements (Si, Be, Mg, Na, P) in increasing order of metallic character | NCERT Intext 3.4 Question Solution

❓ 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

1. 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).

2. 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).

3. 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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