In 1950 the manufacture of this type of lamp ceased. The atomic number for beryllium is 4. Covalent radiusHalf of the distance between two atoms within a single covalent bond. The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis. A toxic bivalent element, beryllium is a steel grey, strong, light-weight yet brittle, alkaline earth metal, that is primarily used as a hardening agent in alloys (most notably, beryllium copper). Chemical 4 element of periodic table. The disease may take up to five years to manifest … 2) You may not distribute or commercially exploit the content, especially on another website. Beryllium exists in 30 different minerals, among which bertrandite, beryl, chrysoberyl, and phenacite are the most important. Beryllium is a chemical element in the Periodic Table marked with the atomic number of 4 and with the chemical symbol Be. Beryllium is a chemical element in the periodic table that has the symbol Be and atomic number 4. Beryllium is also found as a trace metal in slags and fly ash. Why is … From the Greek word beryl, a type of mineral. It is a bivalent and highly toxic element. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. It is a chemical element with symbol ‘Be’ with atomic number 4 in the periodic table. In chemistry and atomic physics, the electron affinity of an atom or molecule is defined as: the change in energy (in kJ/mole) of a neutral atom or molecule (in the gaseous phase) when an electron is added to the atom to form a negative ion. It is a steel-gray metal that is quite brittle at room temperature. Beryllium atomic number is 4 and the symbol is Be. X + e– → X– + energy        Affinity = – ∆H. Home. Asked by Wiki User. It is an alkaline - earth metal.Beryllium is white gray in color and it is relatively soft and also one of the lightest of all metals in the second group. The RSC maintains this Site for your information, education, communication, and personal entertainment. The atomic number of each element increases by one, reading from left to right. The configuration of these electrons follows from the principles of quantum mechanics. Beryllium is somewhat unique in its ability to appear transparent to X-rays. Transition Metals-Copper. Where more than one isotope exists, the value given is the abundance weighted average. Answer. One application is in windows for X-ray machines. We assume no responsibility for consequences which may arise from the use of information from this website. A higher recycling rate may reduce risk to supply. Brief exposure to a lot of beryllium, or long exposure to a little, will bring on this lung condition which is known as berylliosis. Pornographic, defamatory, libellous, scandalous, fraudulent, immoral, infringing or otherwise unlawful use of the Images is, of course, prohibited. The atomic radius of a chemical element is a measure of the distance out to which the electron cloud extends from the nucleus. Copper-beryllium alloy is commonly used to make bushings, bearings, and springs. Classified as an alkaline earth metal, beryllium is a solid at room temperature. Sometimes truly enormous crystals of bertranide turn up, one specimen found in Maine in the USA was over 5 metres in length and weighed almost 20 tonnes. Beryllium was discovered by French chemist and pharmacist Nicholas-Louis Vauquelin in beryl, a silicate mineral (Be3Al2Si6O18) and emerald (variety of beryl) in 1797. The number of electrons in an electrically-neutral atom is the same as the number of protons in the nucleus. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. We welcome your feedback. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. Introduction to what is Beryllium Beryllium being the lightest member of the family of alkaline earth metal has an atomic number 4 and belongs to group 2, period 2, and s-block in the periodic table. The name beryllium was adopted officially in 1957. Beryllium forms 4-coordinated complex ions. Beryllium is a chemical element with symbol Be and atomic number 4. Beryllium (Be) has an atomic number of four and four protons in its nucleus, but it is incredibly rare both on Earth and in the universe. The chemical symbol for beryllium is be. X - Electrons, O - Electron shells. Position in the Periodic Table. What is the beryllium group and period number? Berkelium is a soft, silvery-white, radioactive actinide metal. doi:10.1142/ S0219633606002726 Alkaline Earth Metals + Beryllium. In such cases we would ask you to sign a Visual Elements licence agreement, tailored to the specific use you propose. Beryllium is a silver-grey metal and is hard and brittle at room temperature. Text © The Royal Society of Chemistry 1999-2011 Since berylium has very low threshold energy for neutron emission, it can be used as a neutron source in nuclear reactors. The minerals beryl and emerald are beryllium silicates and were known to the ancient world; the emperor Nero used a large emerald the better to view gladiatorial fights in the area. It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system. Fun Facts: - Beryllium is the lightest member of it's … Periodic Table of Elements Element Beryllium - Be. The RSC has been granted the sole and exclusive right and licence to produce, publish and further license the Images. The Cookies Statement is part of our Privacy Policy. 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