Chemistry, 10.10.2019 23:30 mathman783

Compare the electron-dot formulas of ch4 and h2o. why do these molecules have approximately the same bond angles but different molecular shape?

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Answer from: bumeh511

Answer :

First we have to determine the hybridization of the following molecules.

Formula used :

$\text{Number of electron pair}=\frac{1}{2}[V+N-C+A]$

where,

V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

(1) The given molecule is, CH_4

$\text{Number of electrons}=\frac{1}{2}\times [4+4]=4$

The number of electron pair are 4 that means the hybridization will be sp^3 and the electronic and molecular geometry of the molecule will be tetrahedral. The bond angle is 109.4^o

(2) The given molecule is, H_2O

$\text{Number of electrons}=\frac{1}{2}\times [6+2]=4$

The number of electron pair are 4 that means the hybridization will be sp^3 and the electronic geometry of the molecule will be tetrahedral.

But as there are 2 atoms around the central oxygen atom, the third and fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent or angular.

From this we conclude that these molecules have approximately the same bond angles but different molecular shape due to repulsion between lone and bond pair of electrons is more in H_2O . Thus, the bond angle which was supposed to be 180^o but it decreases to 109.4^o .

Compare the electron-dot formulas of ch4 and h2o. why do these molecules have approximately the same

Answer from: Quest

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence, the electronegativity (or the ability to attract electrons) is lessened."

Answer from: Quest

put the answers and i could answer.

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Compare the electron-dot formulas of ch4 and h2o. why do these molecules have approximately the same...