3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question
Rajasthan 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 $PX _2$.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.