Question

what is helium ?????​

Answer 1

Answer:

helium a very light colorless gas that's does not burn

Explanation:

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Answer 2

Answer:

Helium, the lightest of the noble gases, had actually been detected and helium is the only element in the periodic table that was discovered by an astronomer.

Helium is the element which you can find on the upper right side of the periodic table with atomic number 2. It comes first amongst the family of the noble gases.

It holds one atomic orbital and was named by Lockyer and Frankland. Its name is derived from the Greek word “Helios” meaning Sun. Scientists knew there is an enormous amount of helium in the Sun before it was discovered.

Helium falls under inert gas since its outermost electron orbital is full of two electrons. Helium can also be found in lasers, compressed air tanks and coolant in nuclear reactors.

It holds the lowest boiling and melting points amongst the all other elements. The Nuclear fusion of hydrogen in stars generates a significant amount of helium.

Isotopes

Physical Properties of Helium

Helium (He) Physical Properties

Melting Point 0.95 K (or -272.2oC)

Boiling Point 4.222 K (or -268.928oC)

Density 0.1786 g/L at STP; 0.145 g.cm-3 at its melting point

Critical Temperature and Pressure 5.195 K; 0.227 MPa

Triple Point 2.177 K; 5.043 kPa

Appearance (at STP) Colourless gas

Chemical Properties of Helium

Helium (He) Chemical Properties

Electron Configuration 1s2

First Ionization Energy 2372.3 kilojoules per mole

Second Ionization Energy 5250.5 kilojoules per mole

Van der Waals Radius 140 picometers

Enthalpy of Fusion 0.0138 kilojoules/mole

Uses of Helium

The primary use of Helium goes in altitudes research and meteorological balloons.

It is utilized as an inert protective gas in autogenous welding.

It is the only cooler capable of declining temperature lower than 15K (-434ºF).

Helium is also used in the production of germanium crystals and silicon crystals.

Since it has the ability to diffuse through solids much faster than air, helium is used industrially for pipeline leak detection.

This element is also used in gas chromatography as a carrier gas.

Owing to its low melting point, liquid helium has numerous applications in cryogenics, magnetic resonance imaging (MRI), and superconducting magnets.

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What is Helium?

Helium is a chemical element with He symbol and Helium is a colourless, tasteless, and odourless gas with atomic number. Helium is the Universe’s second most common element (after hydrogen), accounting for around 24 per cent of its weight.

What type of element is helium?

Helium (He), chemical element, Group 18 inert gas (noble gases) of the periodic table. The second lightest element (the lightest is just hydrogen), helium is a colourless, odourless and tasteless gas that is liquid at −268.9 °C.

Why does helium have a low melting point?

So there is little interaction between the noble gas atoms, giving them a low boiling point. An important thing to note is that the inter molecular forces are rising with atomic size, and that’s why helium has a lower boil than neon, preceded by argon, etc.

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