it is method used to separate particulates from a liquid by allowing in the solids to settle at the bottom of the mixture

Decantation

Explanation:

Decantation is one of the process of separating mixture containing solid and liquid. In this process, gravity plays a very important role. The solid part of the mixture is allowed to settle down. The liquid is removed and separated in another container. It is a process that helps in the purification of the liquid. The particles that are insoluble settles down and is further subject to be separated from the mixture.

it's c. elements are placed in rows based on how may valencies electrons have.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)