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3 years ago

Which of these elements is a noble gas? hydrogen (H) barium (Ba) nitrogen (N) krypton (Kr) bromine (Br)

Chemistry

2 answers:

ruslelena [56]3 years ago

8 0

Krypton...it is based off of its location on the periodic table

NNADVOKAT [17]3 years ago

3 0

Answer : The correct option is krypton (Kr).

Explanation :

Noble gas : It is a group which is present at last in the periodic table and they belongs to group 18.

The general electronic configuration of noble gas is $(ns^2np^6)$ .

The noble gas contains six elements which are helium, neon, argon, krypton, xenon and radon.

According to the question,

Hydrogen belongs to group 1 which is a alkali metal.

The general electronic configuration of hydrogen is $(ns^1)$ .

Barium belongs to group 2 which is an alkaline earth metal.

The general electronic configuration of barium is $(ns^2)$ .

Nitrogen belongs to group 15 which is a non-metal.

The general electronic configuration of nitrogen is $(ns^2np^3)$ .

Bromine belongs to group 17 which is a halogen.

The general electronic configuration of bromine is $(ns^2np^5)$ .

Krypton belongs to group 18 which is a noble gas.

The general electronic configuration of krypton is $(ns^2np^6)$ .

Therefore, the correct answer is krypton (Kr).

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Let us first take a look at the image below;

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The stronger acid is shown with the one with more negative $P_{Ka}$ Value.

∴ The equilibrium constant for the acid-base reaction is expressed as:

$K_{eq}= \frac{K_a of reactant acid}{K_a of product acid}$

$= \frac{10^{-pK} of reactant acid}{10^{-pk} of product acid}$

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From the chemical equation (shown in the attached image); the equilibrium constant for the acid-base reaction can be expressed as:

$K_{eq}=\frac{10^{-pK} of hydrobromic acid}{10^{-pk} of Ethyloxonium acid}$

$K_{eq}=\frac{10^{-5.8} of hydrobromic acid}{10^{-2.4} of Ethyloxonium acid}$

$= 10^{-3.4}$

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