Water has two bonding pairs of electrons and two lone pairs and would have the notation A X E 2 2. In order to correctly answer this question, we must first use the A X E model and assign the correct notation to Put the following molecules in order of increasing bond angle. 5 ∘ and A X E 3 and A X E 2 2 moleculesĮxample 3: Comparing the Bond Angles of Simple Molecules 5 ∘ smaller for every extra pair of nonbonded electrons that are counted on any They state, for example, that theĪngle will be approximately 2. The combination of one lone pair and one bonded pair has a strength somewhere between these two extremes.Ĭhemists have several rules that help them understand bond angles. The strongest repulsive electrostatic interactions are between two lone pairs of electrons, and the weakest repulsive electrostatic interactionsĪre between two bonded pairs of electrons. Lone pairs of electrons take up the most space in the valence shell of the central atom, and they generate the strongest repulsive electrostatic interactions To determine that option E is the correct answer for this question. This suggests that the N H 3 molecule belongs to the A X E 3 group. There are three bonded pairs of valence electrons and just one lone pair of electrons. The other two valence electrons do notįorm any bonds. Three of these valence electrons are used to make covalent bonds with hydrogen atoms. The X Īnd E terms represent bonded and nonbonded electron pairs.Īn example of a molecule with a trigonal pyramidal shape would be the ammonia molecule ( N H 3).
In the A X E method, the central atom is referred to as A. Using the A X E method, which of the following A X E notations corresponds toĪ molecule with a trigonal pyramidal shape?
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Example 1: Understanding How to Classify Molecules with the AX 𝑚E 𝑛 Method
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