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How do non-bonded electron pairs help determine the shape of molecules?
Wiki User
∙ 13y ago
Non bonded pairs have a higher force of repulsion than bonded pairs, as the bonded pairs also feel the pull of another positive nucleus. The shape of a molecule is distorted. 2 example - NH3 (one lone pair) & H2O (2 lone pairs). NH3 is trigonal pyramidal while H2O is bent.
Wiki User
∙ 13y ago
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What is the difference between the arrangement of electron pairs and the shape of the molecules?
The shape of a molecule only describes the arrangement of bonds around a central atom. The arrangement of electron pairs describes how both the bonding and nonbonding electron pair are arranged. For example, in its molecular shape, a water molecule is describes as bent, with two hydrogen atoms bonded to an oxygen atom. However, the arrangement of electron pairs around the oxygen atom is tetrahedral as there are two bonding pairs (shared with the hydrogen) and also two nonbonding pairs.
What is the role of unshared electron pairs in predicting molecular geometries?
Lone electron pairs give the geometry a triangular base.
What causes water molecules to have a bent shape according to VSEPR threory?
Repulsion of the unshared electron pairs (2)and the bonded pairs (2) around the central oxygen atom. Repulsion of these 4 electron pairs attempts to form a tetrahedral shape. Describing the molecular shape, we ignore the unshared electrons and just describe the shape of the molecule based on the location of the atoms, thus bent.
What is the molecular shape of a molecule that has two electron pairs in which both pairs are shared?
linear
How many lone pairs electron in CCl4?
Zero
What factors affect the shape of the molecule?
The factors affecting the shape of the molecules are the bonded e and the lone pairs of electrons
What are paired electrons?
Pi electron pairs are electron pairs residing in the p orbital (as in s, p, d, f). This is the electron orbital responsible for double bonds and conjugated molecules according to molecular orbital theory.
What are postulates of vsepr theory?
1: Both the lone pairs asa well as the bond pairs participate in determining the geometery of the molecules 2: The electron pairs are arranged around the central polyvalent atom so as to remain at a miximum distance apart to avoid repulsions 3: The electron pairs of lone pairs occupy more space then the bond pairs from ncert:- 1)The shape of a molecule depends upon the number of valence shell electron pairs (bonded or nonbonded) around the central atom. 2)Pairs of electrons in the valence shell repel one another since their electron clouds are negatively charged. 3)These pairs of electrons tend to occupy such positions in space that minimise repulsion and thus maximise distance between them. 3)The valence shell is taken as a sphere with the electron pairs localising on the spherical surface at maximum distance from one another. 4)A multiple bond is treated as if it is a single electron pair and the two or three electron pairs of a multiple bond are treated as a single super pair. 5) Where two or more resonance structures can represent a molecule, the VSEPR model is applicable
How does number of electron pairs around central atom determine its shape?
The electron pairs repel one another. The electron pairs can be in chemical bonds or be present as "lone pairs". This is the basis of VSEPR theory proposed by Gillespie and Nyholm. Who both shared the first name of Ronald! (British readers may see the humour in that )
Why are a molecules atoms as far away from each other as they can get?
Forces between electron pairs push the atoms apart.
What is true of a Lewis base?
A Lewis base donates electron pairs.
How is VSEPR theory helpful?
Valence shell electron pair theory is useful in predicting the shapes of molecules. All that is done is to count the number of electron pairs around an atom and then work out the shape as the pairs of electrons repel each other. 2 pairs linear 3 pairs trigonal planar 4 pairs tetrahedral etc
Why are a molecules atoms as far away from each other as thet can get?
Forces between electron pairs push the atoms apart.
Why are molecules atom's as far away from each other as they can get?
APEX!!!Forces between electron pairs push the atoms apart.
What does the VSEPR theory redict?
The geometry of molecules. In this theory the valence electron pairs around an atom repel one another.
What determine the molecule geometry of a molecule?
Consider: Number of bonding domains on the central atom Number of non-bonding electron pairs (lone pairs) on the central atom
What is the difference between the arrangement of electron pairs and the shape of the molecules?
The shape of a molecule only describes the arrangement of bonds around a central atom. The arrangement of electron pairs describes how both the bonding and nonbonding electron pair are arranged. For example, in its molecular shape, a water molecule is describes as bent, with two hydrogen atoms bonded to an oxygen atom. However, the arrangement of electron pairs around the oxygen atom is tetrahedral as there are two bonding pairs (shared with the hydrogen) and also two nonbonding pairs.
