The atomic nucleus and the cloud of electrons.
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Nucleus and electrons
An atom is containing of electrons, protons, neutrons and other sub atomic particles. Normally the two major regions that comprise the view of the modern atom are nucleus and the electron cloud. The electrons are moving in the electron shell and the nucleus provide space for protons, neutrons, and sub atomic particles.
Electron orbitals or electron clouds. These regions represent the probability of finding an electron at a specific location around the nucleus of an atom.
No, H2O2 is not an atom; it is a molecule. H2O2, or hydrogen peroxide, is composed of two hydrogen atoms and two oxygen atoms bonded together. Each hydrogen atom is an individual atom, and each oxygen atom is an individual atom.
An atom with two neutrons, two protons, and two electrons is a helium atom. Helium is the second element on the periodic table and has an atomic number of 2.