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Structure of the Atom — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
MCQ
For an element, $Z = 9.$ The valency of this element will be:
  • A
    $4$
  • B
    $2$
  • ✓
    $1$
  • D
    $3$
✓

Answer

Correct option: C.
$1$
Atomic number is $9$, which means that number of electrons is also $9.$
Electronic configuration is $2 , 7.$
So, the atom will gain $1$ electron to complete its octet.
Therefore, the valency is $1.$

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