An atom is defined as

The smallest unit of matter that still keeps its chemical properties
The smallest unit of matter
The smallest particle
The smallest unit of matter that does not have chemical properties

The smallest unit of matter that still keeps its chemical properties.

Step-by-step explanation:

By common sense, we know that it is the smallest unit of matter. But if we look up the definition, it says, the basic unit of a chemical element. So therefore it is both, the smallest unit of matter that still keeps its chemical properties.

Sorry if wrong.

understand that i don't know the answers

will someone answer his question

sas (side angle side)

aa(angle angle)

sss(side side side)

sas you have to find two sides with an angle in between

aa you find two angles because it will always add up to 180

sss find all sides

step-by-step explanation: