What is a helium gas?
helium (He), chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element (only hydrogen is lighter), helium is a colourless, odourless, and tasteless gas that becomes liquid at −268.9 °C (−452 °F).
What are the gases on the periodic table?
What are the 11 gases on the periodic table? The gaseous element group; hydrogen (H), nitogen (N), oxygen (O), fluorine (F), chlorine (Cl) and noble gases helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn) are gases at standard temperature and pressure (STP).
Which elements are not noble gases?
Hydrogen is not a noble gas. Any of the gaseous elements Helium, Neon, Argon, Krypton, Xenon, and Radon, occupying Group 0 (18) of the periodic table are noble gases as they are totally unreactive.
What is the formula of helium gas?
He
Properties Of Helium
| Chemical formula | He |
|---|---|
| Molecular weight | 4.003 g/mol |
| Chemical names | Atomic helium, Helium-4, and p-Helium |
| Density | 0.1786 g/L |
| Electronic configuration | 1s2 |
How is helium gas made?
This type of helium gas, referred to as helum-4, is produced naturally underground through the radioactive decomposition and decay of certain elements such as uranium and thorium. The result of this reaction are alpha-particles containing two neutrons and protons.
What are the 11 gaseous elements?
A look at the periodic table shows us that there are 11 elements in the table that exist in the gaseous state at room temperature. These elements are Hydrogen, Helium, Nitrogen, Oxygen, Fluorine, Chlorine, Neon, Argon, Krypton, Xenon, and Radon.
Is Xenon a gas at STP?
Xenon is a chemical element with the symbol Xe and atomic number 54….
| Xenon | |
|---|---|
| Phase at STP | gas |
| Melting point | 161.40 K (−111.75 °C, −169.15 °F) |
| Boiling point | 165.051 K (−108.099 °C, −162.578 °F) |
| Density (at STP) | 5.894 g/L |