State the occurrence of group-$18$ elements.
All elements of group-$18$ except radon and oganesson occur in the atmosphere. They are gases under standard conditions.
The atmospheric abundance in dry air is $1 \%$ by volume,of which argon is the major constituent.
Helium and sometimes neon are found in minerals of radioactive origin,such as pitchblende,monazite,and cleveite.
The main commercial source of helium is natural gas.
Xenon and radon are the rarest elements of the group. Radon is obtained as a decay product of ${}^{226}Ra$:
${}_{88}^{226}Ra \rightarrow {}_{86}^{222}Rn + {}_{2}^{4}He$
Oganesson has been synthetically produced by the collision of ${}_{98}^{249}Cf$ atoms and ${}_{20}^{48}Ca$ atoms:
${}_{98}^{249}Cf + {}_{20}^{48}Ca \rightarrow {}_{118}^{294}Og + 3{}_{0}^{1}n$
Oganesson has an atomic mass of $294$,an atomic number of $118$,and a half-life of $0.7 \ ms$.
The atmospheric abundance in dry air is $1 \%$ by volume,of which argon is the major constituent.
Helium and sometimes neon are found in minerals of radioactive origin,such as pitchblende,monazite,and cleveite.
The main commercial source of helium is natural gas.
Xenon and radon are the rarest elements of the group. Radon is obtained as a decay product of ${}^{226}Ra$:
${}_{88}^{226}Ra \rightarrow {}_{86}^{222}Rn + {}_{2}^{4}He$
Oganesson has been synthetically produced by the collision of ${}_{98}^{249}Cf$ atoms and ${}_{20}^{48}Ca$ atoms:
${}_{98}^{249}Cf + {}_{20}^{48}Ca \rightarrow {}_{118}^{294}Og + 3{}_{0}^{1}n$
Oganesson has an atomic mass of $294$,an atomic number of $118$,and a half-life of $0.7 \ ms$.
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Similar Questions
The noble gases have closed-shell electronic configuration and are monoatomic gases under normal conditions. The low boiling points of the lighter noble gases are due to weak dispersion forces between the atoms and the absence of other interatomic interactions.
The direct reaction of xenon with fluorine leads to a series of compounds with oxidation numbers $+2, +4$ and $+6$. $XeF_4$ reacts violently with water to give $XeO_3$. The compounds of xenon exhibit rich stereochemistry and their geometries can be deduced considering the total number of electron pairs in the valence shell.
$1.$ Argon is used in arc welding because of its
$A.$ low reactivity with metal
$B.$ ability to lower the melting point of metal
$C.$ flammability
$D.$ high calorific value
$2.$ The structure of $XeO_3$ is
$A.$ linear
$B.$ planar
$C.$ pyramidal
$D.$ $T$-shaped
$3.$ $XeF_4$ and $XeF_6$ are expected to be
$A.$ oxidizing
$B.$ reducing
$C.$ unreactive
$D.$ strongly basic
Give the answer for questions $1, 2$ and $3$.
The direct reaction of xenon with fluorine leads to a series of compounds with oxidation numbers $+2, +4$ and $+6$. $XeF_4$ reacts violently with water to give $XeO_3$. The compounds of xenon exhibit rich stereochemistry and their geometries can be deduced considering the total number of electron pairs in the valence shell.
$1.$ Argon is used in arc welding because of its
$A.$ low reactivity with metal
$B.$ ability to lower the melting point of metal
$C.$ flammability
$D.$ high calorific value
$2.$ The structure of $XeO_3$ is
$A.$ linear
$B.$ planar
$C.$ pyramidal
$D.$ $T$-shaped
$3.$ $XeF_4$ and $XeF_6$ are expected to be
$A.$ oxidizing
$B.$ reducing
$C.$ unreactive
$D.$ strongly basic
Give the answer for questions $1, 2$ and $3$.
The order of liquefaction of noble gases is:
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View SolutionThe percentage of $Ar$ in dry air is approximately .......... $\%$. (in $\%$)
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