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They do not exist in a stable natural state. They had to be made by man in the same way as many of the Actinides This is wrong. Unlike most actinides, they all exist as stable isotopes and some are reasonably common. The main reason is that they are very chemically similar to one another and thus are hard to isolate as pure elements. this is rite...

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15y ago
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11y ago

Noble gases are found in small amounts and generally they do not combine with other elements. So difficult to identify

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11y ago

Noble gases are found in small quantities. And they donot form compounds. hence were the last to be discovered.

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Q: Why were the noble gases the last elements to be discovered?
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Why do you think the noble gases were among the last of the natural occurring elements to be discovered?

Noble gases exist in nature in very low concentration and are very unreactive. These prevented their discovery earlier.


Why are noble gases are among the last of the naturally occurring elements to be discovered?

Because they don't react with anything else; when you're looking for reactions, noble gasses are invisible.


Group 8A also referred to as Group 18 elements on the periodic table share which characteristics?

The group 18 elements, also called the noble gases, are gaseous elements, completely nonreactive, with a full, stable valence shell. They were the last elements to be discovered because they're inert.


Which side of the periodic table contains noble gases?

right side, last group (or last column). Noble gases are group 18 elements.


What is the placement of the noble gases and why?

The last column of the periodic table of elements


What group of the region shown on the periodic table contains mostly elements that are gases at room temperature?

The so-called noble or inert gases are in Group 18, the last group on the right of the periodic table of the elements.


What is the last group in the periodic table called?

There are no 'rows' on the Periodic Table of the Elements.I assume you are talking about Group-18 of the table.Group-18 of the Periodic Table of the Elements are the noble gases. These elements have a full valence shell (8 electrons).


What elements have full s and p orbitals?

Elements with full s and p orbitals in their highest electron shell are the noble, or inert, gases of the last column on the periodic table: He, Ne, Ar, Kr, Xe, and Rn.


The elements in group 18 of the periodic table?

Group 18 is the noble gases, the last group on the periodic table. The elements are Helium, Neon, Argon, Krypton, Xenon, and Radon. These elements have a full outer shell and are virtually nonreactive.


Where are the noble gases located on the periodic table and what does their position reveal about their reactivity?

the noble gases are positioned on the last column on the right. As the elements descend down the column they are more reactive


Why is helium located in the last colunm?

Because helium has completely filled orbitals as do all the elements in the last column (group 18 elements or noble gases).


Why do you think the noble gases were among the last of the naturally occurring elements to be dicovered?

Noble gases are chemically inert, they do not form compounds. They are found in trace amounts and hence difficult to be identified.