Write the formulas for the following covalent compounds:
1) antimony tribromide
2) hexaboron silicide
3) chlorine dioxide
4)hydrogen iodine
5) iodine pentafluoride
6) dinitrogen trioxide
7) nitrogen trihydride
8) phosphorus triiodide

Write the names for the following covalent compounds:
9) P4S5
10) O2
11) SeF6
12)Si2Br6
13)SCI4
14)CH4
15)B2Si
16)NF3