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2. structure of atom — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
The nucleus of an element contain $ 9 $ protons. Its valency would be
  • ✓
    $1$
  • B
    $3$
  • C
    $2$
  • D
    $5$
✓

Answer

Correct option: A.
$1$
a
(a) Since its nucleus contain $9$ proton so its. atomic number is $ 9$ and its electronic configuration is $  2, 7. $ So it require one more electron to complete its octet. Hence its valency is $1.$

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