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STD 11 - 3. Classification of elements and periodicity in properties — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3. Classification of elements and periodicity in properties4 Marks
MCQ
Nucleus of an element contains $9$ protons. It's valency would be
  • ✓
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $5$
✓

Answer

Correct option: A.
$1$
a
As nucleus of the element contains nine protons, its atomic number is $9$. Hence, the electronic configuration of the element is $2, 7$. It needs one more electron to attain the stable inert gas configuration.

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