15. When a solution of silver nitrate is added to a solution of potassium chlorate no precipitate forms. How do you account for the fact that a precipitate of silver chloride is not formed?
CHAPTER XXIX
TIN AND LEAD
| SYMBOL | ATOMIC WEIGHT | DENSITY | MELTING POINT | COMMON OXIDES | |
| Tin | Sn | 119.0 | 7.35 | 235° | SnO SnO2 |
| Lead | Pb | 206.9 | 11.38 | 327° | PbO Pb3O4 PbO2 |
The family. Tin and lead, together with silicon and germanium, form a family in Group IV of the periodic table. Silicon has been discussed along with the non-metals, while germanium, on account of its rarity, needs only to be mentioned.
The other family of Group IV includes carbon, already described, and a number of rare elements.
TIN
Occurrence. Tin is found in nature chiefly as the oxide (SnO2), called cassiterite or tinstone. The most famous mines are those of Cornwall in England, and of the Malay Peninsula and East India Islands; in small amounts tinstone is found in many other localities.