Helium and neon do not form compounds with fluorine.

Just like all noble gases, it is very non-reactive. So much so, that it doesn’t form compounds with anything. It is non-reactive because it’s shells are full. Because neon has two atomic shells, it needs two electrons in the first and eight to fill the second.

Atoms of hydrogen have a single proton in their center and a single electron in the lowest energy level. Helium atoms, on the other hand, have two protons and two electrons in the lowest energy level. This is a very stable arrangement, and helium in consequence is an inert gas with few chemical properties.

But hydrogen has only one proton so it doesn’t have the potential to hold two electrons like helium does. So if another atom of hydrogen happens to come by with its lone electron, the two atoms can share the pair of electrons making them both more stable.

10 Uses for Helium: More Than Balloons and Blimps

• Heliox mixtures in respiratory treatments for asthma, bronchitis and other lung deficiencies.
• MRI magnets.
• High speed Internet and Cable TV.
• Mobile phone, computer and tablet chips.
• Computer hard drives.
• Cleaning rocket fuel tanks.
• Microscopes.
• Airbags.

It’s bordered by water on its sides, which, owing to helium’s low solubility in water, keeps it from escaping. The Helium Reserve, however, is scheduled to be closed permanently on September 30, 2021.

Helium does not freeze at atmospheric pressure. Only at pressures above 20 times atmospheric will solid helium form. Liquid helium, because of its low boiling point, is used in many cryogenic systems when temperatures below the boiling point of nitrogen are needed.

There are no liquids that do not freeze. Such a substance is called a supercooled liquid. In order for a liquid to have the property of never freezing, its freezing point must be absolute zero, the lowest temperature that matter can reach: 0 Kelvin or -459.67 degrees Fahrenheit.

A chunk of copper became the coldest cubic meter (35.3 cubic feet) on Earth when researchers chilled it to 6 millikelvins, or six-thousandths of a degree above absolute zero (0 Kelvin). This is the closest a substance of this mass and volume has ever come to absolute zero.

Liquid helium can prove to be very fatal if touched as it exists at a very low temperature of -269°C i.e. about 4K or -452.2°F. Therefore if touched it can cause numbness in the hand which develops due to the inactivation of nerve sensation.

At normal atmospheric pressure, liquid helium boils at at temperature of just 4.2 Kelvins (-452.11 Fahrenheit).

Superfluid helium’s dual nature is at work again when it climbs the walls of a container. (Watch this YouTube video of the effect.) In superfluid helium, the frictionless film slithers over the whole container, creating a sort of arena through which the superfluid can flow.

Absolute zero, technically known as zero kelvins, equals −273.15 degrees Celsius, or -459.67 Fahrenheit, and marks the spot on the thermometer where a system reaches its lowest possible energy, or thermal motion. There’s a catch, though: absolute zero is impossible to reach.

Nothing in the universe — or in a lab — has ever reached absolute zero as far as we know. Even space has a background temperature of 2.7 kelvins. But we do now have a precise number for it: -459.67 Fahrenheit, or -273.15 degrees Celsius, both of which equal 0 kelvin.

But what about absolute hot? It’s the highest possible temperature that matter can attain, according to conventional physics, and well, it’s been measured to be exactly 1,420,000,000,000,000,000,000,000,000,000,000 degrees Celsius (2,556,000,000,000,000,000,000,000,000,000,000 degrees Fahrenheit).

Summary: On the absolute temperature scale, which is used by physicists and is also called the Kelvin scale, it is not possible to go below zero – at least not in the sense of getting colder than zero kelvin. At zero kelvin (minus 273 degrees Celsius) the particles stop moving and all disorder disappears.