Element: helium |
Name : helium |
Symbol : He |
Atomicnumber : 2 |
Relativeatomicmass : 4.002602 (2) g, r [see notes g r] |
Standardstate : gas at 298 K |
Appearance : colourless |
Classification : Non-metallic |
Groupinperiodictable : 18 |
Groupname : Noble gas |
Periodinperiodictable : 1 |
Blockinperiodictable : p |
Shellstructure : 2 |
CASRegistry : 7440-59-7 |
Description : Helium is one of the so-called noble gases. Helium gas is an unreactive, colourless, and odourless monoatomic gas. Helium is available in pressurised tanks. |