one electron, one proton, and one neutron (mass number 2). H2 does form compounds with most elements despite its stability. Its atomic number is 1 and its atomic weight 1,00797 g/mol.
Hydrogen is the smallest chemical element because it consists of only one proton in its nucleus. Hydrogen can be produced from renewable resources, such as by reforming ethanol (this process emits some carbon dioxide) and by the electrolysis of water (electrolysis is very expensive). First element in the periodic table. Hydrogen in the environment: Hydrogen forms.15 of the earth's crust, it is the major constituent of water. Combustion, when mixed with air and with chlorine it can spontaneously explode by spark, heat or sunlight. The Physical Properties of Hydrogen are as follows: What are the Physical Properties of Hydrogen? At high temperatures its highly reactive. When hydrogen bonds with fluorine, oxygen, or nitrogen, it can participate in a form of medium-strength noncovalent (intermolecular) bonding called hydrogen bonding, which is critical to the stability of many biological molecules. At standard temperature and pressure, hydrogen is a nontoxic, nonmetallic, odorless, tasteless, colorless, and highly combustible diatomic gas with the molecular formula.