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To write the lewis structure for KBR let's first. Write k and then. BR potassium that's a metal and then bromine is a nonmetal when we have a metal and a nonmetal we have an ionic compound and valence electrons will be transferred from the metal to the nonmetal so potassium is in Group 1 on the periodic table it. Has one valence electron bromine is in group 17 sometimes called 7a it has 7 valence electrons in an ionic compound we said. That valence electrons are transferred. So if the potassium transfers its valence electron to the bromine because electrons are negative and potassium is just lost an electron it lost a negative charge it's positive and the bromine which gained that electron now it's negative because we have a positive and a negative these opposite charges attract and they form the ionic bond to show that the valence. Electrons were transferred and they're not being shared between the atoms like in a covalent bond we need to put brackets around the negative ion you'll often see brackets around the positive. Ion as well and that makes this the lewis structure for KBR potassium bromide note that this is what we call a formula unit with ionic compounds they're in a crystal and they're made up of a group of repeating formula. Units this is useful though because it shows us how the electron was transferred from the potassium to the bromine completing the octet of the bromine and making it very stable this is dr. B with the lewis structure for KBR potassium bromide thanks. For watching.

 


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