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Groups and Periods (Mendeleev's)

Are He,Ne,Ar,...

Question

Are He,Ne,Ar,Kr,Xe and Rn the only known noble gases?

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Solution

As per the latest data available, apart from Helium, Neon, Argon, Krypton, Xenon and Radon, no other noble gas has been identified. These six are the only known noble gases that are universally recognised. Also note that the periodic table lists all the elements that are known till date. There is no such element which is known and is not listed in the periodic table.

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Q. The noble gases are a group of chemical elements with very similar properties. The six noble gases that occur naturally are helium (He), neon (Ne),argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn).The noble gases are:
(a) Mono atomic, colorless and odorless
(b) diatomic, colorless and odorless
(c) have very low chemical reactivity

Q. Which of the following is/are true about - He, Ne, Ar, Kr, Xe, Rn etc. ?

Q. Noble gases (like He, Ne, Ar, Kr etc.) are isolated from air. One of the steps is/are:

Q. Read below given tabular form and answer the questions.

Element	Electronic configuration	Element	Electronic configuration
He	$1 s^{2}$	Kr	$4 s^{2} 4 p^{6}$
Ne	$2 s^{2} 2 p^{6}$	Xe	$5 s^{2} 5 p^{6}$
Ar	$3 s^{2} 3 p^{6}$	Rn	$6 s^{2} 6 p^{6}$

Write the names of 'noble gas' elements.

Q. In the case of noble gases, the following trend

X e > K r > A r > N e > H e

is correct for: i) boiling point ii) solubility in water iii) ionization enthalpy iv) ease of liquefaction.

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