What are atoms and what are its particles?

An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.

Explanation:

Atoms are the smallest particle of an element which can exist freely in nature.

The particles present in it are known as sub-atomic particles. They are:-

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante