Predict the block, period and group of (Z:12)

Explanation:

Atomic number = 12

Block = s-block

Period = 3rd

Group = 2nd

In the case of water, an object with a density less than 1 g/cm3 will float. The closer its density is to 1 g/cm3, the more of it will sit below the water level.

Explanation:

Whether an object will float or sink is dependent on its density, and on the density of the liquid it is placed in.