꧂ ATOMS consist of a nucleus made of protons and neutrons orbited by electrons. Atoms are the basic units of matter and the defining structure of elements. The term "atom" comes from the Greek word for indivisible, because it was once thought that atoms were the smallest things in the universe and could not be dividedhydrogen, oxygen, carbon, and nitrogen, the four most COMMON elements in the solar system.Definition of atom in physicsnoun. Physics. the smallest COMPONENT of an element having the chemical properties of the element, CONSISTING of a nucleus CONTAINING combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction; the number of protons determines the identity of the element.How can atoms be seen ?Atoms are small. ... In fact, even the most powerful light-focusing microscopes can't visualise single atoms. What makes an object visible is the way it deflects visible light waves. Atoms are so much smaller than the wavelength of visible light that the two don't really interact.Hope this helps please mark as Brainliest and follow me and thank my answer ✌️✌️✌️✌️✌️✌️