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pychu [463]
3 years ago
13

Which of the following electron configurations for neutral atoms is correct?

Chemistry
2 answers:
geniusboy [140]3 years ago
8 0
Argon: 1s22s22p63s23p6  is right answer,
Serjik [45]3 years ago
6 0

Answer : The correct option is argon.

Explanation :

Neutral atom : It is defined as an atom has equal number of electrons and protons.

  • The given electronic configuration of magnesium is,

1s^22s^22p^63s^23p^6

The atomic number of magnesium is 12 that means it has 12 number of protons and 12 number of electrons.

As per given electronic configuration, there are 18 electrons are present in magnesium which is the electronic configuration of argon. So, this is not a neutral atom.

  • The given electronic configuration of argon is,

1s^22s^22p^63s^23p^6

The atomic number of argon is 18 that means it has 18 number of protons and 18 number of electrons. So, this is a neutral atom.


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Does any solid Ag₂CrO₄ form when 2.7x10⁻⁵g of AgNO₃ is dissolved in 15.0 mL of 4.0x10⁻⁴MK₂CrO₄?
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Molarity of Ag+ is less than the molar solubility thus ppt will not occur.

Balanced reaction-:

<h3>2AgNO3(aq)+K2CrO4(aq)→Ag2CrO4(s)+2KNO3(aq)</h3>

Moles of AgNO3=mass(g)molar mass (g/mol) =2.7×10−5g / 169.86 gmol

=1.589⋅10^−7 mol

Molarity of Ag+=moles of solute(L)=1.589⋅10−7 mol0.015 L=1.059⋅10−5M

Ksp of Ag2CrO4

=[Ag+]2[CrO42−]

1.2⋅10−12=[2s]2[s]

4s3=1.2⋅10−12

s=6.69⋅10−5 M

Molarity of Ag+ is less than the molar solubility thus ppt will not occur.

<h3>What is the molarity calculation formula?</h3>

The volume of solvent required to dissolve the provided solute is multiplied by the ratio of the moles of the solute whose molarity has to be computed. (M=frac{n}{V}) The molality of the solution that needs to be computed in this case is M. n is the solute's molecular weight in moles.

Learn more about Molarity:

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