This list includes 5 Chemical Elements that start with H that start with H, from “Hafnium” to “Hydrogen”. They range from light gases to heavy transition metals and appear in energy, cooling, electronics, and magnets.
[Chemical Elements that start with H] are chemical elements whose names begin with the letter H and include gases, noble gases, metals, and heavy synthetic atoms. Hydrogen, the most abundant element in the universe, is a notable example with wide cultural and scientific significance.
Below you’ll find the table with atomic number, atomic weight, and discovery year.
Atomic number: The element’s unique integer that tells you the number of protons and helps order the periodic table.
Atomic weight: The standard atomic weight with three decimals, so you can compare typical isotope masses for calculations and reference.
Discovery year: The year or timeframe when the element was first identified, which helps you trace historical and scientific context.
Chemical Elements that start with H
| Name | Symbol | Atomic number | Standard atomic weight | Description |
|---|---|---|---|---|
| Hydrogen | H | 1 | 1.01 | Lightest element, discovered by Henry Cavendish (1766); fuels stars, found in water and organic compounds, used in ammonia production, fuel cells, and rocket propellants. |
| Helium | He | 2 | 4.00 | Discovered in the Sun (1868) and isolated on Earth later; inert noble gas used in balloons, cryogenics, and MRI cooling; second-most abundant element in the universe. |
| Holmium | Ho | 67 | 164.93 | Named for Stockholm (Holmia), discovered 1878; a rare-earth metal used in specialized magnets, lasers, nuclear alloys, and glass coloration; notable magnetic properties. |
| Hafnium | Hf | 72 | 178.49 | Discovered 1923 by Hevesy and Coster; dense, corrosion-resistant metal used in nuclear control rods, high-temperature alloys, and microelectronics (semiconductor gate dielectrics). |
| Hassium | Hs | 108 | 269 | Synthetic element first produced 1984 in Darmstadt; very short-lived isotopes studied for superheavy-element chemistry and nuclear physics, with no commercial applications. |