They generally do not react with other elements. In other words, they're "too good" to associate with anything else. When discussing metals, it also means that they don't corrode (i.e. they don't oxidize). Noble metals such as gold and platinum are considered more valuable than metals such as silver, which slowly tarnishes.
less reactive
Noble gases have completely filled octet. They are stable.
less reactive
Noble means complete. They have complete outermost energy levels. They are unlikely to react.
less reactive
If by octect you mean the outermost shell, then yes.. that's why they're noble gasses (inert)
The noble metals are a group of metals that resist oxidation and corrosion in moist air. They are the opposite of the base metals, which more readily oxidize and corrode. Some of the noble metals are gold, platinum, and iridium. Aside from being corrosion resistant, they are also very expensive.
Noble metals: platinum, iridium, rhodium, palladium, osmium, ruthenium, silver, goldNoble gases: helium, neon, argon, krypton, xenon, radonNoble in this case has the significance of with low chemical reactivity.
There are no "noble metals". The "noble" connotation for "noble gas" is that in society, the "noble" people don't interact with the average people. "Noble" or inert gases do not take part in any regular chemical reactions. The individual atoms don't form elements or compounds.
'Royal gas' is not a term used in chemistry. Perhaps you mean "noble gas", if so yes "inert gas" and "noble gas" often mean the same thing. However, oxides and fluorides of some of the "noble gasses " do exist, it might be best to think of them as "noble" rather than "inert". Xe, forms oxides.
It depends on the key of the periodic table. Usually it signifies the type of element, e.g., alkali metals, nonmetal, noble gases, metalloid, rare eath metals, transition metals. However, it can mean other things.
Most non-reactive? You mean least reactive, right? That would be the noble gases, like Helium, Argon, Xenon, etc. which are all inert. The noble gasses helium and neon tie for the least unstable element as they form no compounds whatsoever. The other nobles gasses can all form a few unstable compounds