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Structure of the Atom — Science STD 9 — Question

Gujarat 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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