My teacher said every element in group 18 in noble gas.?

Question

li is true? What about Ununoctium, with number of proton 118. It also a noble gas?

Answer 1

The noble gases are the elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. Therefore, they rarely react with other elements since they are already stable. Other characteristics of the noble gases are that they all conduct electricity, fluoresce, are odorless and colorless, and are used in many conditions when a stable element is needed to maintain a safe and constant environment.

The noble gases were previously referred to as inert gases, but this term is not strictly accurate because several of them do take part in chemical reactions. Another older term was rare gases, although in fact argon forms a considerable part (0.93% by volume, 1.29% by mass) of the Earth's atmosphere.

The name 'noble gases' is an allusion to the similarly unreactive Noble metals, so called due to their preciousness, resistance to corrosion and long association with the aristocracy.
Property
Element Number 2 10 18 36 54 86 118
Element Name Helium Neon Argon Krypton Xenon Radon Ununoctium
Normal Density 0.1786 0.9002 1.7818 3.708 5.851 9.97 N/A
Atomic Mass 4.00 20.2 39.9 82.92 130.2 222.4 N/A
Boiling Pt. (°C) -268.83 -245.92 -185.81 -151.7 -106.6 -62 N/A
Melting Pt. (°C) -272 -248.52 -189.6 -157 -111.5 -71 N/A

Answer 2

Yes and the old term noble gases is becoming more widespread - they used to be called inert gases as the 'noble' of the old school implied a sort of class snobbery but they're not entirely inert - I doubt this will be of use to you if you're early on in your studies of chemistry but for the record the noble gases such as xenon have been made to react under high pressures with super-reactive fluorine. Tell THAT to your teacher.

I haven't heard anything about Ununoctium (who else hates the new naming system?) but big artifically elements like that tend to have a half life measure in microseconds or faster and so we cant learn much about their chemistry - however we can still use what we know of their orbital structures to posit some guesses. We could still imagine where the halogens were going to be as well as the noble gases. Also the number of protons is also called the Atomic Number.

regards

Answer 3

The name 'Group 18' is incorrect.
It is group 8 or zero (0). Sometimes it is described as VIIIA - Roman numerology.

Yes!!! the elements in Group 8 are noble gases. They are :-
He - Helium
Ne - Neon
Ar - Argon
Kr - Krypton
Xe - Xenon
Rn - Radon (Radio-active).
These are the known noble gases. Historically, they were also known as the 'Inert Gases'.

The element Ununoctium No.118 would be classified as a 'Noble Gas', because its outer electron structure would contain only 8 electrons, the same as all the other noble gases except helium.

Answer 4

All elements in Group 8 or Group 0 are noble gases as the stable structure of the valence shells cause this gases to be inert.

Answer 5

True, all their electron shells are filled so they don't combine easily with other elements, so they were called 'noble' because they don't mix with the more common elements - and that's the true origin of the term.

Element 118 has been synthesized (117 has not) but I don't know what its properties are. There is this thing called the Internet that might be able to help you with this.

Answer 6

Wouldnt be there if it wasnt.

Helium, Neon, Freon,Krypton, Argon... all inert gases.

They don't combine with any other element.

That's because their outer electron shell is FULL.

Answer 7

This is true since they have a full outer electron shell and thus are unreactive. Examples are Neon, xenon, argon, helium