Chemistry Chemical Bonding MDCAT 2015
PMDC Verified Question 95 of 102
Which one of the following is the correct dot and cross diagram of bonding between two chlorine atoms?
A
\( :\ddot{\text{Cl}}\cdot + \cdot\ddot{\text{Cl}}: \longrightarrow :\ddot{\text{Cl}}\cdot\ddot{\text{Cl}}: \)
B
\( :\ddot{\text{Cl}}\cdot + \cdot\ddot{\text{Cl}}: \longrightarrow :\ddot{\text{Cl}}:\ddot{\text{Cl}}: \)
C
\( \text{Cl}^+ + \text{Cl}^- \longrightarrow \text{Cl} + \text{Cl} \)
D
\( :\ddot{\text{Cl}}\cdot + \cdot\ddot{\text{Cl}}: \longrightarrow \text{Cl}^+ + \text{Cl}^- \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: \( :\ddot{\text{Cl}}\cdot + \cdot\ddot{\text{Cl}}: \longrightarrow :\ddot{\text{Cl}}:\ddot{\text{Cl}}: \)
Concept:

Covalent bonding occurs when non-metal atoms share electron pairs to achieve a stable octet configuration.

Formula:

$$ \text{Cl} + \text{Cl} \longrightarrow \text{Cl}_2 $$

Solution:

  • Each chlorine atom (Group VIIA) has 7 valence electrons.


  • To complete its octet, each chlorine atom needs 1 more electron.


  • They share one unpaired electron with each other, forming a single covalent bond (represented by a shared pair ` : `).


Why other options are incorrect:

  • Option A: Shows incorrect sharing notation.
  • Option C & Option D: Represent ionic bonding, which does not occur between two identical halogen atoms.

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