Single Choice

Identify the least reactive element from the following.

A$$_{ 8 }^{ 16 }{ X }$$
B$$_{ 10 }^{ 20 }{ X }$$
Correct Answer
C$$_{ 11 }^{ 23 }{ X }$$
D$$_{ 9 }^{ 19 }{ X }$$

Solution

The inert gases are least reactive elements. The atomic number of inert gases are $$2,10,18,36,54,86$$. Thus out of given options, the element $$_{ 10 }^{ 20 }{ X }$$ has atomic number $$10$$ which is of inert gas and thus it is least reactive. Hence answer is option B.

SIMILAR QUESTIONS

Atomic Structure

Which of the following statements is/are incorrect?

Atomic Structure

If Hunds rule is applicable, $$p^3$$ configuration is $$\upharpoonleft$$ $$\upharpoonleft$$ $$\upharpoonleft$$ because in this arrangement:

Atomic Structure

The first ionisation potential in electron volts of nitrogen and oxygen atoms are, respectively, given by :

Atomic Structure

According to Bohr - Bury scheme, the maximum number of electrons which can be accomodated in a given shell is given by the formula:

Atomic Structure

The stability of ferric ion is due to:

Atomic Structure

Which of the following ions contains minimum number of unpaired electrons?

Atomic Structure

Answer the following: The $$+3$$ oxidation state of lanthanum $$(Z=57)$$, gadolinium $$(Z=64)$$ and lutetium $$(Z=71)$$ are especially stable.

Atomic Structure

Compare : Chlorine atom and chloride ion, with respect to (i) atomic structure, (ii)electrical state

Atomic Structure

Compare : Chlorine atom and chloride ion, with respect to chemical action

Atomic Structure

Compare : Chlorine atom and chloride ion, with respect to toxicity.

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