Respuesta :
Answer: add 2 valence electrons
Explanation:
You have to make up for the negative electrons so you add them
When the ion is -2 charged we add 2 electrons to the total number of valence electrons.
Explanation:
- Lewis structure is a simplified representation of the bonding of atoms in a molecule.
- It also represents the number of valence electrons and their distribution in the molecule.
- This electronic configuration should be of order by which all the octets of atoms in a molecule are complete.
- In order to draw a lewis structure of a molecule or ion count the valence electrons of all atoms in the ion or molecule.
- Draw skeletal structure of molecule or ion.
- Now add valence electrons to the structure with the help of dots
- For ions, if the charge on the ion is negative then add the number of electrons equal to the magnitude of negative charge to the total valence electrons.
- For ions, if the charge on the ion is positive then subtract the number of electrons equal to the magnitude of positive charge from the total valence electrons.
So from this, we can conclude that when the ion is -2 charged we add 2 electrons to the total number of valence electrons.
Learn more about lewis structure here:
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