Write the formula for:

a) potassium sulfide:
b) potassium chloride:
c) dinitrogen trioxide:
d) ammonium hydroxide:
e) tin (IV) oxide:
f) cadmium fluoride:
g) Coblat (II) sulfide :
h) beryllium iodate :
i) trisulfur dioxide:
j) nickel (II) oxalate ;
k) copper (I) oxide :
l) aluminum carbonate :
m) sulfur hexafluoride:
n) calcium chlorate :
o) cesium nitride :