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BRIDGE BONDING · ADVANCED CONCEPT

[BeCl₂]ₙ
Polymeric beryllium chloride

Solid BeCl₂ is represented by a continuing chain rather than isolated BeCl₂ molecules. Chlorine atoms bridge neighbouring Be centres repeatedly, giving each Be a tetrahedral chain environment in the classroom model.

Repeating 3c–4e chlorine bridgesChemical BondingInteractive 3D lab
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STRUCTURE REASONING

How [BeCl₂]ₙ bridge bonding works.

The visible 3 Be + 8 Cl fragment contains four internal bridges and four terminal continuation chlorines that point toward omitted neighbouring Be centres. Each repeating Be–Cl–Be path uses the chlorine lone-pair 3c–4e description.

BOND COUNT

Repeating bridge units; model window shows 3 Be and 8 Cl

TERMINAL VS BRIDGE

The finite model is a window cut from an extended solid chain, not a discrete molecule.

ADVANCED CONCEPT CHECKLIST

Facts to read from the 3D model.

  1. The formula [BeCl₂]ₙ denotes an extended polymeric solid, not a separate molecular dimer.
  2. Be is described as sp³ in the tetrahedral chain environment, unlike linear monomeric BeCl₂.
  3. End chlorines in the displayed fragment mark continuation beyond the visible model.
  4. The displayed Be–Cl–Be bridge angle is approximately 82° in the simulation model.

SEARCHED QUESTIONS

[BeCl₂]ₙ bridge-bonding FAQ.

Why is solid BeCl2 polymeric?

Electron-deficient Be centres accept chlorine lone-pair density through repeating Be–Cl–Be bridges, producing an extended chain.

What does [BeCl2]n mean?

It means the BeCl₂ connectivity repeats through a polymeric solid rather than ending as one isolated molecule.

How is polymeric BeCl2 different from Be2Cl4?

Be₂Cl₄ is a finite vapour-phase dimer with an approximately planar Be environment, while solid [BeCl₂]ₙ continues as a chain with tetrahedral Be surroundings.

MOLECULE-BY-MOLECULE GUIDES

Study every bridge-bonding system.

Open a focused structure guide, then use the shared 3D lab to rotate the complete molecule and compare bridge formation.