Question

请帮我写出下列各个元素的化合价!

Answer 1

1.Cu+1S-2

2.Fe+2S-1

3.CU+2Fe+2S-2

4.Xe+4F-1

5.Na+1S+2O-2

6.Na+1O-1

7.Ca+2C-1

8.K+1　　　O2为超氧根整体-1价　　　所以O-1/2