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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
An element $'P'$ has atomic number $56.$ What will be the formula of its halide ?
  • A
    $PX$
  • ✓
    $PX_2$
  • C
    $PX_3$
  • D
    $P_2X_3$
✓

Answer

Correct option: B.
$PX_2$
b
Element $'P ^{\prime}$ with atomic number $56$ will lose two electrons to form $P ^{2+}$ ion with $54$ electrons corresponding to the stable noble gas electronic configuration. Halogen gains one electron to form $X ^{-}$ion. One $P ^{2+}$ ion combines with two $X ^{-}$ ions to form $PX _2$.

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