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Noble gases are the quiet ones, they are the least reactive on the periodic table. Noble gases have completely filled orbitals / energy levels. They generally have 8 valence electrons (helium has only 2 valence electrons). Helium and neon have filled valence shells. The noble gases have high ionization energies and stable electronic configuration, so they have little tendency to gain or lose electrons. Hence they are chemically inert and generally do not form compounds under normal conditions. The noble gases have low boiling points and are all monatomic gases at room temperature.

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Gases can be compressed with little force used. Solids and liquids are virtually incompressible. If you were to set up an apparatus that allowed you to increase the pressure inside a vessel, it would be noted that the volume of the liquid and the solid would change very little, but the volume of the gas would decrease. This is due to the intermolecular forces between the individual molecules.

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Helium is the most inert of all elements, and it does not form any compounds at all, under any circumstances.

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Helium is an element.

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Actually every element is arranged by atomic number and which electron shell is their outermost one.

most often, the columns in the table share certain characteristics, so the metals, non-metals, and Noble gases (also non-metals) arrange pretty much by column, with columns 1-12 being metals, 13-16 split between metalloids and non-metals, 17 being non-metal only, and 18 being Noble gases.

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Mainly due to their mass. For example, Helium is lighter than Krypton and thus Helium has a lower boiling point (i.e. it is harder to liquify).

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None. No compounds of Helium are known. However under some circumstances in glow dischagre tubes unstable molecualr compounds can be created- these are called "excimers".

This is why it can be used in hot air balloons, as it can be heated to extreme temperatures, and used for buoyancy, but will not react and cause an explosion, as hydrogen would.

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No the hydrogen nucleus is a proton.

The helium nucleus is an alpha particle.

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Argon is a noble gas.

It has the electronic configuration

1s2, 2s2, 2p6, 3s2, 3p6

It has got a noble gas core . (A pseodo noble gas core has a (n-1) d10 electrons in level below the below the ns2, np6 )

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an atomic number of 2 and an atomic weight of about 4. So it has 2 protons, 2 neutrons, and 2 electrons. It has a complete valence shell (the smallest atom with this attribute) which makes it the smallest noble gas. It has a cas# of 7440-59-7... I'm not sure what you're asking. I can go on but it would be better if you'd ask a more specific question. You can email me too.

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Nothing. Helium and CO2 are non reactive with each other. Helium is a noble gas and not reactive at all. This mixture is used as a welding shield to minimize slag, and if oxygen is also included it is used as a deep diving air mix.

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They are not very reactive and they do not form bonds with each other, so molecules of noble gases cannot be formed, there are only atoms, i.e. they are monatomic gases..

Up until 1962 no noble gas compounds were known however compounds of Argon, Krypton Xenon and Radon all form unstable compounds with fluorine.

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Noble gases are not reactive. It was long believed that they could not form compounds. However since 1962 compounds of Ar, Kr, Xe and radon have been prepared. These are not stable.

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The accepted modern theory of elemental formation states:

The lighter elements are a bi-product of nuclear fusion from stellar masses (stars).

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Because the outer electron shell is full as is the case with helium and neon or because it has the stable octet configuration, with 8 electrons, which is true for the rest, argon, krypton, xenon and radon.

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It is a colorless, odorless, tasteless, nontoxic, and nearly inert gas that heads the noble gas series in the periodic table

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The electron configuration of thorium is [Rn]6d27s2.

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the whole room

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It is [Ar] 4s2 3d2

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The electron configuration of uranium is (short): [Rn]5f36d17s2.

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That depends on the size of the balloon.

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5250 kj/mol

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