To explain the history of nuclear energy we could distinguish three major stages:
- Physical and chemical scientific studies of the elements.
- The development of the nuclear bomb during World War II.
- Use of nuclear energy in the civil field.
Scientific studies cover this whole period since the first Greek philosophers began to define atoms, until the development of the first nuclear bomb. In this process, different scientists discover the presence of electrons, neutrons and protons and properties that make one atom more radioactive than another.…
What is an atom? Imagine you have a piece of iron. The parts. You still have two pieces of iron but smaller. The you come from again ... Every time have smaller pieces until you reach a moment that if the seeming from what you would no longer be iron.
At this point what is left is an atom, an iron atom. Definition of atom
From a more formal way, we define as the smallest atom in an element can be divided without losing its chemical properties particle.
The origin of the word atom comes from the Greek, meaning indivisible. At the time that these particles were baptized…
The atomic number is a physical and chemical concept related to the structure of the atoms of each element. The total number of protons (elementary positive charges) of the nucleus of a given atom is treated. It is represented by the letter Z. The conventional symbol Z possibly comes from the German word Z ahl which means number.
The atomic number is used to classify elements within the periodic table of elements.
The sum of the atomic number Z and the number of neutrons N gives the mass number A of an atom. Atoms with the same atomic number Z, but different numbers of neutrons…
A molecule is a set of chemically bonded atoms. The electric charge of the molecules is neutral.
There is a definition of an older molecule that is less general and less precise: "A molecule is the smallest part of a substance that can have an independent and stable existence while preserving its chemical properties and certain physicochemical properties." By this definition there could be molecules with a single atom. Types of molecules
Molecules can be formed in two different ways:
- Discrete molecules: molecules may consist of a well-defined number of atoms…
The atomic nucleus is the small central part of the atom, with a positive electric charge and in which most of the mass of the atom is concentrated. Ernest Ruthenford discovered it in 1911. After the discovery of the neutron, in 1932, the atomic nucleus model was quickly developed by Dmitri Ivanenko and Werner Heisenberg.
The major subatomic particles in the nuclei of atoms are protons and neutrons or nucleons (except ordinary hydrogen, which contains only one proton). A single chemical element is characterized by the number of protons in the nucleus that determines the total positive…
Isotopes are atoms whose nuclei have the same number of protons but different numbers of neutrons. Not all atoms of the same element are identical and each of these varieties corresponds to a different isotope.
Each isotope of the same element have the same atomic number (Z) but each has a different mass number (A). The atomic number is the number of protons in the atomic nucleus of the atom. The mass number is the sum of neutrons and protons of the core. This means that different isotopes of the same atom differ from each other only by the number of neutrons.
The items that can…
An electron is a stable negatively charged elementary particle which is one of the fundamental components of the atom. For this reason it can also be defined as a subatomic particle. It is part of the group of leptons.
Electrons may appear in the free state (without being attached to any atom) or attached to the nucleus of an atom. There are electrons in atoms spherical layers of different radious. These spherical layers represent energy levels. The larger spherical shell, the greater the energy contained in the electron.
In the electrical conductors, the current flows results…
A proton is a subatomic particle with a positive electric charge that lies within the atomic nucleus of atoms. The number of protons in the atomic nucleus is that which determines the atomic number of an element, as indicated in the periodic table of the elements.
The proton has +1 charge (or, alternatively, 1,602 x 10-19 coulombs), exactly the opposite of the charge -1 containing the electron. In mass, however, there is no competition because the mass of the proton is approximately 1,836 times greater than that of an electron.
The proton is classified as a baryon,…
In physics and chemistry, an ion is an atom or molecule that has a neutral electric charge. It is called cation an ion with positive charge, and an ion anion negatively charged. The process of gaining or losing electrons (relative to the neutral atom or molecule) is called ionization. They usually represent the cations and anions with the symbol for the
A nuclear power plant is a facility for obtaining electrical energy using nuclear energy.
Its operation is similar to that of a thermal power plant or that of a solar thermal plant: from a source of energy thermodynamics is used to obtain heat, with the heat to get steam and with the steam to drive a turbine that will generate electricity.
The difference between the different types of electrical installations is in the energy source: a nuclear power plant uses the heat released in the nuclear fission reactions of certain atoms, in a thermal power station the heat source (thermal…
Nuclear energy is the energy in the nucleus of an atom. Atoms are the smallest particles that can break a material. At the core of each atom there are two types of particles (neutrons and protons) that are held together. Nuclear energy is the energy that holds neutrons and protons.
Nuclear energy can be used to produce electricity. This energy can be obtained in two ways: nuclear fusion and nuclear fission. In nuclear fusion, energy is released when atoms are combined or fused together to form a larger atom. The sun produces energy like this. In nuclear fission, atoms are split into…