Calcium fluoride.

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Ca is metal, F is non-metal, so they type ionic bond.Ca as steel can kind only hopeful ion. Ca in the 2nd group, so the charge of Ca ion is 2+. Ca²⁺F is in the 17th group, for this reason it has actually 7 electrons on the last level. It is non-metal, non-metal, so the has an adverse charge -(8-7)=-1. "8" due to the fact that on the critical level can not be more than 8 electrons. F-ion is F¹⁻.Ca²⁺ F¹⁻Number of optimistic charges should be same to number of negative charges,Formula of calcium fluorideCaF2.2 atom Fluorine bond with Calcium.

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