Molecule is a atom group, the same or different, that if hold together and cannot be separated without affecting or destroying the properties of substances.
There is an old concept that says that a molecule is the smallest part of a substance that retains its compositional characteristics and chemical properties.
However, it is now known that the chemical properties of a substance are not determined by an isolated molecule, but by a minimal set of them.
Many familiar substances are made of molecules, such as sugar, water, and most gases, while other familiar substances are not molecular in structure, such as salts, metals, and other gases. nobles.
Some examples of molecules are when two oxygen atoms combine to form an oxygen molecule. and when a carbon atom combines with two oxygen atoms to form a carbon dioxide molecule. carbon.
See the meaning of general properties of matter.
DNA molecule
The DNA of living beings is also composed of molecules, formed by two parallel strands of nucleotides.
In DNA molecules there are four different types of nucleotides: adenine, cytosine, thymine and guanine.
DNA molecules have the familiar shape of a double spiral, which are linked by hydrogen bonds.
All the genetic instructions that coordinate the development and functioning of living things and some viruses are present in DNA molecules.
Learn more about the meaning of DNA.
Polar and Non-polar Molecule
The polarity of organic molecules is related to the electronegativity of the atoms that make up this molecule.
A molecule is considered polar when the difference in electronegativity of two atoms causes a charge shift to occur.
The molecule is non-polar when there is no difference in electronegativity between the atoms.