Other familiar elements include carbon with 6 protons in its nucleus, nitrogen with 7, oxygen with 8, iron with 26, and uranium with 92. Helium, the second most abundant element in the universe, has atomic number 2. Hydrogen, the most abundant element in the universe, has atomic number 1. In nature, elements are found with atomic numbers from 1 through 92. Nuclear fusion produces more energy per unit mass than fission, and is responsible for the horrific destructive power of the hydrogen bomb (in some cases equivalent to more than 20 million tons of TNT). It occurs in the core of the Sun and other stars. The most common nuclear fusion process involves the conversion of hydrogen to helium. This is called atomic fusion or nuclear fusion. Sometimes elements combine to form other elements with larger atomic numbers. It is also the process by which nuclear reactors generate power. This process is called atomic fission or nuclear fission, and was responsible for the unprecedented explosions of the first atom bombs (equivalent to thousands of tons of TNT). Some elements can be broken down into elements with smaller atomic numbers by so-called atomic or nuclear reactions. The most common naturally occurring isotope of carbon has 6 neutrons in the nucleus, but another, less common isotope has 8. For example, the most common isotope of hydrogen has no neutrons, but isotopes exist with 1 neutron (called deuterium) and 2 neutrons (called tritium). All elements have a particular isotope that is most common in nature. The number of neutrons in the nucleus of an element determines the isotope of the element. The number of neutrons in the atom of a specific element can also vary. If there are more electrons than protons, it is a negative ion if there are fewer electrons than protons, it is a positive ion. However, if the number of electrons is different from the number of protons, the atom is called an ion. If the number of electrons is the same as the number of protons, then the atom has no electric charge. The number of electrons in the atom of a specific element can vary. The number of protons in the nucleus of the atom of an element is known as the atomic number of that element. An element is uniquely determined by the number of protons in the nuclei of its atoms. 1) In chemistry and physics, an element is a substance that cannot be broken down into simpler components by any non-nuclear chemical reaction.
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