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Alkali Metals

arrange the f...

Question

arrange the following in the decreasing order of their electron affinity

$(N a^{+}, N a^{+ +}, N a, N a^{-})$

A

(N a^{+ +}, N a^{+}, N a, N a^{-})

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B

(N a^{-}, N a, N a^{+}, N a^{+ +})

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C

(N a^{+}, N a^{+ +}, N a, N a^{-})

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D

(N a^{-}, N a^{+}, N a^{+ +}, N a)

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Solution

The correct option is A $(N a^{+ +}, N a^{+}, N a, N a^{-})$
The electron affinity of an atom or molecule is defined as the amount of energy released or spent when an electron is added to a neutral atom or molecule in the gaseous state to form a negative ion.

$X + e - \to X^{-} + e n e r g y$
When we add electrons to cation more energy is released as the cation has a smaller size.

Thus, the decreasing order of electron affinity is as follows:

$(N a^{+ +}, N a^{+}, N a, N a^{-})$

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Similar questions

Q. Arrange the following in the decreasing order of their coagulation power:

A l^{3 +}, N a^{+}, C a^{2 +}

Q. What type of crystal defect is indicated in the diagram below?

$N a^{+}$	$C l^{-}$	$N a^{+}$	$C l^{-}$	$N a^{+}$	$C l^{-}$
$C l^{-}$		$C l^{-}$	$N a^{+}$		$N a^{+}$
$N a^{+}$	$C l^{-}$		$C l^{-}$	$N a^{+}$	$C l^{-}$
$C l^{-}$	$N a^{+}$	$C l^{-}$	$N a^{+}$		$N a^{+}$

Q. What type of crystal defect is indicated in the diagram below?

N a^{+}, C 1^{-}, N a^{+}, C 1^{-}, N a^{+}, C 1^{-}

C 1^{- ∙} C 1^{-} N a^{+} ∙ N a^{+}

N a^{+} C 1^{- ∙} C 1^{-} N a^{+} C 1^{-}

C 1^{-} N a^{+} C 1^{-} N a^{+} ∙ N a^{+}

Q. What type of crystal defects is indicated in the diagram given below?

\begin{matrix} N a^{+} & C l^{-} & N a^{+} & C l^{-} & N a^{+} & C l^{-} C l^{-} & □ & C l^{-} & N a^{+} & □ & N a^{+} N a^{+} & C l^{-} & □ & N a^{+} & C l^{-} & C l^{-} C l^{-} & N a^{+} & C l^{-} & N a^{+} & □ & N a^{+} \end{matrix}

n (A \cup B) = n (A) + n (B) - n (A \cap B)

n (A \cap B) = ?

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