The geometry of the molecule actually determines number of electron pairs on the central atom. The electron pairs will be arranged in such a way to minimize the repulsion and therefore, have the lowest possible energy.
Consider: Number of bonding domains on the central atom Number of non-bonding electron pairs (lone pairs) on the central atom
linear
Trigonal pyramidal
Methane has a tetrahedral molecular geometry. It has 4 bonding pairs of electrons and no lone pairs.
The geometry of the molecule actually determines number of electron pairs on the central atom. The electron pairs will be arranged in such a way to minimize the repulsion and therefore, have the lowest possible energy.
Consider: Number of bonding domains on the central atom Number of non-bonding electron pairs (lone pairs) on the central atom
VSEPR theory predicts the geometrical arrangement of atoms in a molecule based on minimizing repulsion between electron pairs. It helps in determining the shape of molecules by considering the number of electron pairs surrounding a central atom.
Consider: Number of bonding domains on the central atom Number of non-bonding electron pairs (lone pairs) on the central atom
two
VSEPR theory helps predict the molecular shape of a molecule based on the arrangement of its atoms and lone pairs. This information is useful for understanding the properties and reactivity of molecules, as well as for predicting their behavior in chemical reactions. Additionally, VSEPR theory can aid in determining the polarity of a molecule, which is important in explaining its interactions with other molecules.
There are two lone pairs of electrons in a molecule of SO2.
There are three lone pairs present in a molecule of KrF2.
The water molecule has two pairs of unbonded electrons, also known as lone pairs. These lone pairs are located on the oxygen atom.
There would be three unshared pairs of electrons in a molecule of hydrogen iodide.
In a DNA molecule cytosine always pairs with guanine, the same is true for an RNA molecule.
it pairs up with guanine.