【】HCCH Lewis structure ,Valence Electrons, Formal Charge

 HCCH (Ethyne) Lewis structure


Answer:

In HCCH Lewis structure,three double bonds exist between the two carbon atoms.Besides,each carbon has one hydrogen atom using  single bond.In HCCH Lewis Dot structure,there are totally ten valence electrons.
C2h2 lewis structure

Explanation:


Hello,today I am going to draw the HCCH Lewis structure in just few steps.


HCCH Lewis structure Setup Step-1:

To draw the HCCH lewis structure , we have to find out the HCCH valence electrons first.We express valence electrons as dots in HCCH 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.


HCCH Lewis structure Setup Step-2:

Now we have to count total number of HCCH Valence electrons.


2×C = 4 ×2 =8

2×H=2×1= 2


So,the total number of HCCH 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.

HCCH Lewis structure Setup Step-3:


Now we have to determine the central atom in HCCH.The central atom is that kind of atom that is single or that has lower electronegativity.In case of HCCH,Carbon,C, is the central atom which has two atoms and H is the outer atom.Hydrogen is always considered as outer atom


HCCH 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.
To have the octet for yellow carbon,we need to move  four valence electrons from red carbon to the between them.
C2H2 Lewis Structure
HCCH Lewis Structure

Now both carbons have satisfied the octet rule and hydrogen has satisfied the duet rule.So, this is the HCCH Lewis Structure.

C2H2 Lewis Structure













HCCH Lewis Structure:Formal Charge




To find the best Lewis structure, we have to find out the formal charge of each atom for HCCH molecule by applying the formula for formal charge.



Formula-3

Formal Charge=Valence Electrons-Dots-Lines
HCCH formal charge
HCCH formal charge


The formal charge of each carbon is zero and the formal charge of each hydrogen is also zero.



So,the best HCCH lewis dot structure will be the one where most atoms will have zero formal charge.Here is the best lewis dot structure for HCCH.
Best HCCH Lewis Structure



Some Questions related to HCCH Lewis Structure


●Which is the correct lewis structure for acetylene HCCH?


Answer: The correct Lewis structure for ethyne,HCCH, is given below:

which is the correct lewis structure for acetylene c2h2
The correct Lewis structure for ethyne,HCCH


●In the chemical compound HCCH, how many pairs of electrons are shared between the two carbon atoms?


Answer:

In the chemical compound HCCH, 
three pairs of electrons are shared between the two carbon atoms.



HCCH Lewis Structure
HCCH Lewis Structure











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