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We are looking for evidence inside the atom

First lets say what a atom is... Atom is the smallest chemically indivisible particle of a chemical element, which is the carrier of its properties. An atom consists of an atomic nucleus and electron shell. The atomic nucleus consists of two kinds of particles of protons and neutrons. Electronic orbitals form the electrically negatively charged electrons.

Atoms with the same number of protons but a different number of neutrons are the isotopes of a chemical element. For example, hydrogen is naturally in the wild in three different isotopes:

If we were looking for even smaller particles would have come across the quarks, which according to the standard model of particle physics elementary particles which consist of hadrons (ie, for example, protons and neutrons). According to the standard model of particle physics have no internal structure and, together with leptons and bosons calibration "smallest" known particles that make up matter. Baryons (eg protons) consist of two "U" quarks and one "D" quark neutrons consist of one "U" quark and two "D" quarks.

Each particle has its opposite, so to speak, "physical mirror image". antiparticle electron is called a positron (antielectron) antiparticle called proton antiproton, neutron antiparticle called antineutron.

Also, quarks have their antiparticles. Research on antiparticles underway at CERN using huge particle accelerator. Antiparticles can be produced by the collision of atoms, but still there is no effective way to maintain antiparticles for longer than a very short while, because antiparticles in contact with matter annihilate immediately.