If atoms conatain smaller particles. why are atoms considered the basic unit of matter

because atoms make up the elements

Atoms are considered the basic unit of matter because it is atoms that make up the elements which in turn combine to form compounds that exist in all states. It is true that atoms are made up of electrons and neutrons and protons, but they are not useful on their own individual level.

NOTE: No cheating

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).