1H1.008
Hydrogen
Reactive non-metal · element 1 · group 1, period 1
Quick facts
| Symbol | H |
|---|---|
| Atomic number | 1 |
| Relative atomic mass | 1.008 |
| Category | Reactive non-metal |
| Position | group 1, period 1 |
| State at 20 °C | Gas |
| Melting point | -259.2 °C |
| Boiling point | -252.9 °C |
| Density | 0 g/cm³ |
| Electronegativity | 2.2 |
| Electron configuration | 1s1 |
About Hydrogen
Hydrogen has the symbol H and atomic number 1, which means every hydrogen atom has 1 proton in its nucleus and one electron. At room temperature it is a gas.
Non-metals are usually poor conductors of heat and electricity. They form covalent bonds with other non-metals and negative ions with metals.
It melts at -259.2 °C and boils at -252.9 °C.
Explore it
See where hydrogen sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.