9 thoughts on “Before Class on Nov. 30: Lewis Structures”
I learned that a resonance structure is an average, or synthesis, of the representations of 2 lewis dot structures. Since electrons have the possibility moving of moving between the two atoms they are bonded to, there is no one precise representation. These videos also aided in helping me assign formal charges to a lewis structure. After evaluated, it can be determined that the most accurate representation is the one with fewest charges. Also, the negative charge will most likely be on the most electronegative atom.
Why does Helium only have 2 electrons in writing lewis dot structures, and why does Boron only have 6?
In these videos i learned about Lewis structures: how to write Lewis structure,exceptions. I also learned about resonance and evaluating Lewis structure.
This video covered the process of writing Lewis Structures. It also covered Resonance; how there can be multiple Lewis structures for a molecule, but the actual structure of the molecule will be more of a synthesis of them instead of one or the other. It talked about how the electrons can be delocalized and move among the bonded atoms. We also learned about formal charges, and how they can be used to predict the likelihood of different Lewis structures and resonance structures. Formal charge is found be subtracting the (lone pair electrons of a certain atom + 1/2 of the bonded electrons) from the total valence electrons. The best Lewis structure will have mostly zero charges and will put the negative charge on the most electronegative atom.
In the following videos, I learned how to illustrate the lewis structure. There could be 2 or more Lewis structure for a particular atom; this is called a resonance. In order to find which resonance contributes more to the real structure, you will need to calculate the formal charge. The best lewis structure is the one with the most zeros and has a negative charge to the most electronegative atom.
When writing Lewis structures, the least electronegative element goes in the middle except if the least electronegative is hydrogen. I learned how to organize and move electrons so that all the elements are stable. I also learned about reasonance.
Answering Amber’s question: Helium has 2 and Boron has 6 because that’s the amount of electrons it can handle; that’s the number of valence electrons they have.
From these videos, I learned how to draw and evaluate a Lewis structure and that a resonance structure can be used when there is more than one way to draw a Lewis structure because of delocalized electrons.
In this lesson, I learn about the steps to write Lewis structures. 1) find the sum of valence electrons in the compound 2) pick the least electronegative element as the central atom 3) fill the octet a of outer atoms then the central one 4) if runs out of e- before central atom has an octet, form multiple bonds. I also learn about resonance and how to evaluate which one is more important in the real structure of the compound.
I learned that Lewis structure helps us understand the structure of a molecule and the properties of a molecule & a substance. When drawing a Lewis structure model, the central atom is the least electronegative element that isn’t hydrogen; that element is usually written first in the formula. I also learned that resonance is when there are two more representations of a Lewis structure for a particular molecule, as well as the ability of atoms in 3rd row or below to have more than 8 electrons in the valence shell when acting as the central atom.
chemistry matters 
I learned that a resonance structure is an average, or synthesis, of the representations of 2 lewis dot structures. Since electrons have the possibility moving of moving between the two atoms they are bonded to, there is no one precise representation. These videos also aided in helping me assign formal charges to a lewis structure. After evaluated, it can be determined that the most accurate representation is the one with fewest charges. Also, the negative charge will most likely be on the most electronegative atom.
Why does Helium only have 2 electrons in writing lewis dot structures, and why does Boron only have 6?
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In these videos i learned about Lewis structures: how to write Lewis structure,exceptions. I also learned about resonance and evaluating Lewis structure.
LikeLike
This video covered the process of writing Lewis Structures. It also covered Resonance; how there can be multiple Lewis structures for a molecule, but the actual structure of the molecule will be more of a synthesis of them instead of one or the other. It talked about how the electrons can be delocalized and move among the bonded atoms. We also learned about formal charges, and how they can be used to predict the likelihood of different Lewis structures and resonance structures. Formal charge is found be subtracting the (lone pair electrons of a certain atom + 1/2 of the bonded electrons) from the total valence electrons. The best Lewis structure will have mostly zero charges and will put the negative charge on the most electronegative atom.
LikeLike
In the following videos, I learned how to illustrate the lewis structure. There could be 2 or more Lewis structure for a particular atom; this is called a resonance. In order to find which resonance contributes more to the real structure, you will need to calculate the formal charge. The best lewis structure is the one with the most zeros and has a negative charge to the most electronegative atom.
LikeLike
When writing Lewis structures, the least electronegative element goes in the middle except if the least electronegative is hydrogen. I learned how to organize and move electrons so that all the elements are stable. I also learned about reasonance.
Answering Amber’s question: Helium has 2 and Boron has 6 because that’s the amount of electrons it can handle; that’s the number of valence electrons they have.
LikeLike
From these videos, I learned how to draw and evaluate a Lewis structure and that a resonance structure can be used when there is more than one way to draw a Lewis structure because of delocalized electrons.
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For NO3-, does it matter which side you put the double bond on when balancing it out?
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In this lesson, I learn about the steps to write Lewis structures. 1) find the sum of valence electrons in the compound 2) pick the least electronegative element as the central atom 3) fill the octet a of outer atoms then the central one 4) if runs out of e- before central atom has an octet, form multiple bonds. I also learn about resonance and how to evaluate which one is more important in the real structure of the compound.
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I learned that Lewis structure helps us understand the structure of a molecule and the properties of a molecule & a substance. When drawing a Lewis structure model, the central atom is the least electronegative element that isn’t hydrogen; that element is usually written first in the formula. I also learned that resonance is when there are two more representations of a Lewis structure for a particular molecule, as well as the ability of atoms in 3rd row or below to have more than 8 electrons in the valence shell when acting as the central atom.
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