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Date: 9-2-2018
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AX2 Molecules: BeH2 (Two Electron Group)
1. The central atom, beryllium, contributes two valence electrons, and each hydrogen atom contributes one. The Lewis electron structure is
2. There are two electron groups around the central atom. The arrangement that minimizes repulsions places the groups 180° apart.
3. Both groups around the central atom are bonding pairs (BP). Thus BeH2 is designated as AX2.
4. with two bonding pairs, the molecular geometry that minimizes repulsions in BeH2 is linear.
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