Hydrogen, as atomic H, is the most abundant chemical element in the universe, making up 75% of normal matter by mass [97] and >90% by number of atoms. [98] In the early universe , the protons formed in the first second after the Big Bang ; neutral hydrogen atoms formed about 370,000 years later during the recombination epoch as the universe ...

Hydrogen is estimated to make up more than 90% of all the atoms three quarters of the mass of the universe! This element is found in the stars, and plays an important part in powering the universe through both the proton-proton reaction and carbon-nitrogen cycle.

Aug 4, 2015 · In kilograms, the mass of a hydrogen atom is 1.67 times 10 to the power of negative 27 or 1.67 x 10-24 grams. That conversion is based on one atomic measurement unit of atomic mass for an atom of hydrogen.

Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.

Nov 21, 2020 · Atomic mass of Hydrogen is 1.0079 u. The atomic mass is the mass of an atom. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element.

Feb 1, 2025 · Answer: The atomic mass of hydrogen is approximately 1.008 atomic mass units (amu). Atomic mass is the weighted average mass of an atom of an element, considering the relative abundances of its isotopes. It is expressed in atomic mass units (amu), where 1 amu = 1/12th the mass of a carbon-12 atom.

Hydrogen is the 1st element in the periodic table and has a symbol of H and atomic number of 1. It has an atomic weight of 1.008 and a mass number of 1. Hydrogen has one proton and zero neutrons in its nucleus, and one electron in one shell.

Name: Hydrogen Symbol: H Atomic Number: 1 Atomic Mass: 1.00794 amu Melting Point:-259.14 °C (14.009985 K, -434.45203 °F) Boiling Point:-252.87 °C (20.280005 K, -423.166 °F) Number of Protons/Electrons: 1 Number of Neutrons: 0 Classification: Non-metal Crystal Structure: Hexagonal Density @ 293 K: 0.08988 g/cm 3 Color: colorless Atomic Structure

Hydrogen (pronounced as Hi-dreh-jen) is a colorless gas represented by the chemical symbol H. It is the first element in the periodic table, belonging to the family of nonmetals [1]. Since hydrogen is a diatomic gas, it’s denoted by the molecular formula H 2.

With an atomic weight of 1.00794 u, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Figure: Shell diagram of Hydrogen (H) atom.