The current accelerated rate of extinction is known as
.

Extinction is a natural phenomena. It is the end of an animal or a groups of animals and is a sharp change in the diversity and abundance of multicellular organisms. The current accelerated rate of extinction is known as Holocene extinction. It is an extinction of species due to the human activity.It also refered as Anthropocene extinction

Three alkali metals in group 1 are calcium, strontium, bariumboron, aluminum, galliumsodium, potassium, rubidiumfluorine, iodine, chlorine