The name of the compound made from lithium chloride and oxygen​

Lithium perchlorate is used as a source of oxygen in some chemical oxygen generators. It decomposes at about 400 °C, yielding lithium chloride and oxygen: LiClO4 → LiCl + 2 O.

precipitation

explanation:

when it goes from cloud to rain/back to earth in the form of rain

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.