The noble gases in group 18 were some of the last natural elements to be discovered. Why do you think this is so?

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Answer 1

Answer:

because they were extremely un-reactive. Being inert, they were difficult to isolate via chemical reactions, thus difficult to distinguish as separate elements

Explanation:

Answer 2

The noble gases of group 18 were the last to be discovered because they are highly unreactive or inert.

Noble gases refer to elements in group 18. These elements are renowned for being inert.

As a result of their inertness and because they are all gases, they are sometimes called "inert gases".

This chemical inertness made it difficult to discover these elements until lately. Many natural elements were discovered because they participate in chemical reactions. Hence, inert gases became the last natural elements to be discovered.

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what does gradiant mean in biology

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The difference in the concentration of a substance between two areas is called the concentration gradient . The bigger the difference, the steeper the concentration gradient and the faster the molecules of a substance will diffuse.

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A “year” on Earth is 365.26 days long. A “year” on Saturn lasts over 29 times longer than Earth. Which of the following best explains this difference between the two planets?

Saturn is farther from the Sun than Earth.

Saturn rotates on its axis faster than Earth.

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Answer: Saturn is farther from the Sun than Earth.

Explanation:

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