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valentina_108 [34]
3 years ago
12

Which of the following elements possesses the fewest valence electrons? bismuth boron barium bromine

Chemistry
2 answers:
denis-greek [22]3 years ago
6 0

Answer:

The correct answer is barium.

Explanation:

Valence electrons are the electrons present in the valence shell of an atom of an element.

Bismuth has atomic number of 83.

[Bi]=[Xe]6s^26p^3

Number of valence electron = 5

Boron has atomic number of 5.

[B]=[He]2s^22p^1

Number of valence electron = 3

Barium has atomic number of 56.

[Ba]=[Xe]6s^2

Number of valence electron = 2

Bromine has atomic number of 35.

[Br]=[Ar]4s^24p^5

Number of valence electron = 7

Barium is one of the element in the given options which possesses fewest number of valence electrons

scZoUnD [109]3 years ago
4 0
Bismuth has 5 valence electrons
Boron has 3 valence electrons 
Barium has 2 valence electrons
Bromine has 7 valence electrons

So therefore, the correct answer would be Barium.
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What are the molality and mole fraction of solute in a 35.9 percent by mass aqueous solution of formic acid (HCOOH)?
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1- The molarity of HCOOH = 9.515 M.

2- The mole fraction of HCOOH = 0.18.

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<em>1- The molarity of HCOOH:</em>

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M = (10pd)/molar mass.

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<em>2- The mole fraction of HCOOH:</em>

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no. of moles of HCOOH = mass / molar mass = (35.9 g)/(46.03 g/mol) = 0.78 mol.

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