10g of an oxide of copper contains 8.882g of copper. what is empirical formula of the copper oxide

Mass of copper oxide: 10g

Mass of copper: 8.882g

Mass of oxygen: 1.118g

                                                                Cu               O

                                                              8.882           1.118

Divide by                                   8.882÷63.5       1.118÷16

                                                               0.14             0.07

Divide by the lowest number          0.14/0.07       0.07/0.07

                                                                  2                  1

Check the ratio now, Cu has 2 atoms and O has 1 atom .

The formula is

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answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.