4. a. Calcium and oxygen react together to form calcium oxide. During the reaction two electrons move from a calcium atom to an oxygen atom. Calcium ions, Ca+, and oxide ions, 0?, are formed. Finish the table. There are two spaces. (2pts) element Number of Arrangement electrons in an atom electrons of Calcium Ca 20 2,8,8,2 Oxygen O 8 2,6 ion Number of Arrangement electronk of electrons in an ion Calcium Ca+ 18 Oxide 0? 10

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