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VanellionAir
I believe it is a Covalent Bond because 1st off, Calcium sulfide is made up of 2 elements, Calcium (Na) and Sulfer (S). Both elements want to obtain 8 electrons to become balanced (An octet) so therefore, these electrons are shared between these 2 elements.
It is a Ionic Bond because Calcium is a metal located in period 4 group 2, Sulfur is a non-metal located in group 6 period 3. It is ionic b/c Ca is a metal and S is a non-metal atom so Ca will give up two valence electrons to Sulfur to make Sulfur's outermost energy level full, so the two elements are stable when they are attracted yo each other

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