Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure.

Uses and properties

Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on Earth.

It is the heaviest essential mineral nutrient. Strontium is an alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly reactive chemically. Uranium best forex pairs is a silvery-white metal in the actinide series of the periodic table.

Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure.

The chemical symbol for Neodymium is Nd. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. The chemical symbol for Praseodymium is Pr. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure.

Oxidation states and isotopes

Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. The chemical symbol for Tellurium is Te. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure.

Elastic properties

Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Caesium has physical and chemical properties similar to those of rubidium and potassium. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd.

Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. The chemical symbol for Ytterbium is Yb. Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure.

• Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure.
• As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on Earth.
• Gold often occurs in free elemental (native state), as nuggets or grains, in rocks, veins, and alluvial deposits.
• Vanadium is a hard, silvery grey, ductile, and malleable transition metal.

Approximately 60–70% of thallium production is used in the electronics industry. Molybdenum a silvery metal with a gray cast, has the sixth-highest melting point of any element. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. Carbon is one of the few elements known since antiquity.

Hardnesses

The symbol Au is from the Latin word aurum. Aurum means “shining dawn” or just “gold” in Latin. Ancient Romans used this word for gold thousands of years ago. Gold’s symbol, Au, is used in many fields.

Gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars.

Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. The chemical symbol for Palladium is Pd. Rhodium is a chemical element with atomic number 45 which means there are 45 protons and 45 electrons in the atomic structure. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure.

Electronegativity (Pauling scale)The tendency of an atom to attract electrons towards itself, expressed on a relative scale. The description of the element in its natural form. Murray Robertson is the artist behind the images which make up Visual Elements. This is where the artist explains his interpretation of the element and the science behind the picture. IsotopesAtoms of the same element with different numbers of neutrons. GroupA vertical column in the periodic table.

• It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds.
• The chemical symbol for Technetium is Tc.
• Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles.
• Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure.
• The chemical symbol for Palladium is Pd.
• Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite.

Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure.

Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. In nuclear reactors, promethium equilibrium exists in power operation. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium. Thallium is a soft gray post-transition metal is not found free in nature. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores.

Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). In nuclear industry gadolinium is commonly used as a neutron absorber due to very high neutron absorbtion cross-section of two isotopes 155Gd and 157Gd. In fact their absorption cross-sections are the highest among all stable isotopes.