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Materials : Metals and Non-Metals — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceMaterials : Metals and Non-Metals1 Mark
MCQ
How many electrons are generally present in metals in their valence shell$?$
  • ✓
    $1, 2$ or $3$
  • B
    $7, 8$ or $9$
  • C
    $10, 11$ or $12$
  • D
    $20, 30$ or $40$
✓

Answer

Correct option: A.
$1, 2$ or $3$
Metals generally have $1, 2$ or $3$ electrons in their outermost orbit or valence shell. e.g.
$i. $Sodium $- (Na) - 2, 8, 1.$
$ii.$ Magnesium $(Mg) - 2, 8, 2.$
$iii.$ Aluminium $- (Al) - 2, 8, 3.$
The number of valence electrons in sodium, magnesium and aluminium metals are $1, 2$ and $3$ respectively.

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