Atoms & Molecules topics include: Hybridisation, homonuclear and heteronuclear molecules, molecular orbital and valence bond Theory. Atoms are the smallest unit of matter that still has all the properties of its element. Molecules are made up of one or more atoms connected by chemical bonds. The word atom comes from the Greek word atomos, which means indivisible. Atoms are so small that it takes millions of them to make a speck of dust. Molecules can be made up of the same or different atoms. For example, an oxygen molecule has two oxygen atoms, while a water molecule has two hydrogen... Show more Atoms & Molecules topics include: Hybridisation, homonuclear and heteronuclear molecules, molecular orbital and valence bond Theory. Atoms are the smallest unit of matter that still has all the properties of its element. Molecules are made up of one or more atoms connected by chemical bonds. The word atom comes from the Greek word atomos, which means indivisible. Atoms are so small that it takes millions of them to make a speck of dust. Molecules can be made up of the same or different atoms. For example, an oxygen molecule has two oxygen atoms, while a water molecule has two hydrogen atoms and one oxygen atom. Biological molecules, such as proteins and DNA, can be made up of many thousands of atoms. Valence bond (VB) theory is a theory that describes the formation of covalent bonds and the electronic structure of molecules. It was developed by Walter Heitler and Fritz London in 1927. The theory assumes that electrons occupy atomic orbitals of individual atoms within a molecule. It also assumes that the electrons of one atom are attracted to the nucleus of another atom. VB theory states that the overlap of incompletely filled atomic orbitals leads to the formation of a chemical bond between two atoms. The unpaired electrons are shared and a hybrid orbital is formed. VB theory views bonds as weakly coupled orbitals (small overlap). It considers that the overlapping atomic orbitals of the participating atoms form a chemical bond. According to VB theory, a covalent bond results when two conditions are met: An orbital on one atom overlaps an orbital on a second atom The single electrons in each orbital combine to form an electron pair VB theory accounts for the directional nature of covalent bonds Show less
Atoms & Molecules topics include: Hybridisation, homonuclear and heteronuclear molecules, molecular orbital and valence bond Theory.
Atoms are the smallest unit of matter that still has all the properties of its element. Molecules are made up of one or more atoms connected by chemical bonds.
The word atom comes from the Greek word atomos, which means indivisible. Atoms are so small that it takes millions of them to make a speck of dust. Molecules can be made up of the same or different atoms. For example, an oxygen molecule has two oxygen atoms, while a water molecule has two hydrogen atoms and one oxygen atom. Biological molecules, such as proteins and DNA, can be made up of many thousands of atoms.
Valence bond (VB) theory is a theory that describes the formation of covalent bonds and the electronic structure of molecules. It was developed by Walter Heitler and Fritz London in 1927. The theory assumes that electrons occupy atomic orbitals of individual atoms within a molecule. It also assumes that the electrons of one atom are attracted to the nucleus of another atom. VB theory states that the overlap of incompletely filled atomic orbitals leads to the formation of a chemical bond between two atoms. The unpaired electrons are shared and a hybrid orbital is formed. VB theory views bonds as weakly coupled orbitals (small overlap). It considers that the overlapping atomic orbitals of the participating atoms form a chemical bond.
According to VB theory, a covalent bond results when two conditions are met: An orbital on one atom overlaps an orbital on a second atom The single electrons in each orbital combine to form an electron pair VB theory accounts for the directional nature of covalent bonds
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