One remedy for a deficiency of vitamin B12 for the elderly is a regular injection of this important nutrient. The vitamin B12 injection dose depends on factors such as gender and age.
Hydrogen bonds happen in alcohols. As a matter of fact, any molecule that contains a hydrogen atom attached to an atom of nitrogen or oxygen is capable of such a bond. Ethanol is one such alcohol that features hydrogen bonds. Ammonia is an example of hydrogen bonding. In the case of ammonia, however, the hydrogen bond happens to be relatively weak.
The substances that are held by covalent bonds are molecular substances. Substances that are held by ionic bonds are ionic substances. The group of atoms held together by covalent bonds is called a molecule. Diatomic molecules . Molecules that consist of two atoms shared covalently, such us Cl 2, H 2 (1e), F 2, O 2, N 2, etc. Covalent bonding may be presented in three ways: 1. Nonpolar.