【】C2H2 Lewis structure ,Valence Electrons, Formal Charge
C2H2 (Ethyne) Lewis structure
Answer:
In C2H2 Lewis structure,three double bonds exist between the two carbon atoms.Besides,each carbon has one hydrogen atom using single bond.In C2H2 Lewis Dot structure,there are totally ten valence electrons.
Hello,today I am going to draw the C2H2 Lewis structure in just few steps.
C2H2 Lewis structure Setup Step-1:
To draw the C2H2 lewis structure , we have to find out the C2H2 valence electrons first.We express valence electrons as dots in C2H2 lewis dot structure.
To get the valence electrons of carbon,we need to look at the electronic configuration of carbon.
C(6)=1s²2s²2p²
The highest value of principal quantum number here is n=2.
The highest value of principal quantum number ,n , indicates the valence shell and we know the electrons in valence shell is called valence shell.
The nunber of valence electrons in carbon is 4.
Now,to draw the lewis dot structure of carbon,we need to imagine a square around carbon.
We know a square has four sides.At first,we have to place one valence electrons as dot to every side of that square before pairing up.
Again, we have to find out the valence electrons of hydrogen(H).
To get the valence electrons of hydrogen(H),we need to look at the electronic configuration of hydrogen (H).
H(1)=1s¹
The highest value of principal quantum number here is n=1.
The highest value of principal quantum number ,n , indicates the valence shell and we know the electrons in valence shell is called valence shell.
The nunber of valence electrons in hydrogen(H) is 1.
C2H2 Lewis structure Setup Step-2:
Now we have to count total number of C2H2 Valence electrons.
2×C = 4 ×2 =8
2×H=2×1= 2
So,the total number of C2H2 valence electrons is ten ( 8+ 2 =10) .These 10 valence electrons have two tasks at the the same time.They connect all the atoms and satisfy the duet rule of hygrogens and octet rule of two carbon atoms.
C2H2 Lewis structure Setup Step-3:
Now we have to determine the central atom in C2H2.The central atom is that kind of atom that is single or that has lower electronegativity.In case of C2H2,Carbon,C, is the central atom which has two atoms and H is the outer atom.Hydrogen is always considered as outer atom
C2H2 Lewis structure Setup Step-4:
Now we need to connect the two central atoms using single bond or line(-) or two dots【●●).
Every line represent two 【●●】dots or two valence electrons.
In the above structure,we have used 2 valence electrons.So,we have 10-2 = 8 valence electrons left.
Now we need to connect the outer atoms equally with both carbons.
So,to connect 2 hydrogen atoms ,we have used 4 valence electrons out of 8 .Now we have (8 - 4 =4) four valence electrons left.
Now use these 4 valence electrons to satisfy octet for central atom.
Look ,red carbon or (A) carbon atom has 8 valence electrons here.But the yellow carbon or (B) has 4 valence electrons.
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| C2H2 Lewis Structure |
Now both carbons have satisfied the octet rule and hydrogen has satisfied the duet rule.So, this is the C2H2 Lewis Structure.
CH2CH2 Lewis Structure:Formal Charge
To find the best Lewis structure, we have to find out the formal charge of each atom for C2H2 molecule by applying the formula for formal charge.
Formula-3
Formal Charge=Valence Electrons-Dots-Lines
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| C2H2 formal charge |
The formal charge of each carbon is zero and the formal charge of each hydrogen is also zero.
So,the best C2H2 lewis dot structure will be the one where most atoms will have zero formal charge.Here is the best lewis dot structure for C2H2.
Some Questions related to C2H2 Lewis Structure
●Which is the correct lewis structure for acetylene C2H2?
Answer: The correct Lewis structure for ethyne,C2H2, is given below:
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| The correct Lewis structure for ethyne,C2H2 |
●In the chemical compound C2H2, how many pairs of electrons are shared between the two carbon atoms?
Answer:
In the chemical compound C2H2,
three pairs of electrons are shared between the two carbon atoms.
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