Sodium and chlorine atoms combine readily because they both tend to lose electrons. true or false

False, Sodium loses electrons (making it a cation) and chlorine gains an electron (making it an anion). This is because both atoms need a full outer shell in order to bond.

Sodium is part of the group I which tends to lose an electron. On the other hand, chlorine atom is in group 17 which tends to gain one electron. The combination of these atoms is due to transfer of electron from one element to the other. 

Ifound this on google “aristotle (384–322 bc) in western scientific taxonomy the greek philosopher aristotle was the first to classify all living things, and some of his groups are still used today, like the vertebrates and invertebrates, which he called animals with blood and without blood.” i hope this you for what your looking for.