Atomic number of hydrogen (symbol H

Atomic number of hydrogen (symbol H) in the periodic table is one, and atomic mass is 1.008 g/mol (approximated by four digits). The hydrogen atom is formed by a nucleus with one unit of positive charge (proton) and one electron. The electron carries a negative charge and is usually described as occupying a “probability cloud” surrounds the nucleus somewhat like a fuzzy, spherical shell. Charges of the proton and electron of each hydrogen atom cancel each other out, so that individual hydrogen atom is electrically neutral. The mass of a hydrogen atom is concentrated in its nucleus. Indeed, the proton is more than 1800 times more massive than the electron. Neutron can be present in the nucleus. Neutron has almost the same mass as proton and does not carry a charge. The radius of the electron’s orbit, which defines the size of the atom, is approximately 100,000 times as large as the radius of the nucleus. Size of hydrogen atom in its ground state is 10-10 m (1 angstrom).