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#### markosheehan

##### Member

- Jun 6, 2016

- 136

2ca+o2->2cao

i would of said each calcium atom has a O.N of +2 and o2 has a O.N of 0

the o in 2cao has a O.N of -2 so that means the ca has a O.N of +2. but that makes no sense. where did as where did the oxygen gain the 2 electrons if the O.N of ca stays the same

im doing these questions wrong