Ответить на вопросы:
1 What is called a molecule?
2 Is a molecule visible to the human eye?
3 What is the atom composed by?
4What do we call the smallest particles of the atom?

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A molecule is a group of atoms bonded together.No, a molecule is not visible to the human eye as it is extremely small.An atom is composed of protons, neutrons, and electrons.The smallest particles of an atom are called subatomic particles, which include protons, neutrons, and electrons.