7 NITROGEN - N

• Nitrogen, formed from the collapse of stars containing carbon and oxygen, it is a key component of amino acids and nucleic acids, which are essential building blocks of life. Nitrogen is also used in many industrial processes, including the production of fertilizers and the production of ammonia for use in refrigeration.

• Nitrogen is a chemical element with the symbol N and atomic number 7. It is a non-metal and a member of group 15 of the periodic table. Here are some of the key properties of nitrogen:

  • Physical Properties: Nitrogen is a colorless, odorless, and tasteless gas. It is relatively inert at room temperature and does not react easily with other elements.

  • Chemical Properties: Nitrogen is a diatomic molecule, which means it exists as two atoms of nitrogen bonded together. It is a non-metal, and it typically forms covalent bonds with other non-metals. Nitrogen has a relatively high electronegativity, which means it attracts electrons strongly in chemical bonds. Nitrogen does not readily combine with other elements to form new compounds, although it can react under certain conditions.

  • Atomic Properties: Nitrogen has an atomic mass of 14.0067 u. It has 7 protons and 7 electrons in its neutral state. Nitrogen has three stable isotopes: 14N, 15N, and 16N.

  • Occurrence: Nitrogen makes up about 78% of the Earth's atmosphere. It is also found in many organic and inorganic compounds, such as proteins and DNA. Nitrogen is an essential element for life, as it is a key component of many biological molecules.