Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. Fermium is a member of the actinide series. Occurrence. Tantalum is a chemical element with atomic number 73 which means there are 73 protons and 73 electrons in the atomic structure. The chemical symbol for Radium is Ra. Francium is a highly radioactive metal that decays into astatine, radium, and radon. By convention, the negative sign shows a release of energy. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. The chemical symbol for Gold is Au. Characteristics and Properties Under normal conditions, potassium is a soft silvery-white metal. PHYSICAL PROPERTIES OF Potassium, Characteristics such as Refractive Index, Density of Potassium, Molecular Weight, Atomic Mass. The standard SI unit is kilograms per cubic meter (kg/m3). It is occasionally found in native form as elemental crystals. Adding a heat will convert the solid into a liquid with no temperature change. Odourless Soluble in Water, Glycerol, Ethanol. The nucleus is composed of protons and neutrons. Because of its high reactivity, potassium is not found free in nature. The chemical symbol for Molybdenum is Mo. Radon is a radioactive, colorless, odorless, tasteless noble gas. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. Electronegativity is related with ionization energy and electron affinity. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys. It is white with a silvery shine or luster. The only metal that is lighter than potassium is lithium. Solids are similar to liquids in that both are condensed states, with particles that are far closer together than those of a gas. Actinium is a soft, silvery-white radioactive metal. 1) Voltage-dependent K+ (KV) channels increase their activity with membrane depolarization and are important regulators of smooth muscle memb … Authors M T Nelson 1 , J M Quayle. K + e– → K–        – ∆H = Affinity = 48.4 kJ/mol. Therefore the electronegativity is greatest at the top-right of the periodic table and decreases toward the bottom-left. Properties, occurrence, and uses Potassium metal is soft and white with a silvery lustre, has a low melting point, and is a good conductor of heat and electricity. Moreover, nonmetals have more positive affinity than metals. Potassium can lose one electron easily to form potassium cation. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Potassium has a vapor pressure given in mbar by [5]: Potassium is an alkali-metal denoted by the chemical symbol K and atomic number Z = 19. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. It has a melting point of 441 degrees Celsius and begins to decompose at 350 degrees Celsius. Potassium does not react with hydrocarbons (kerosene or mineral oil). Increasing the pressure on an material (especially for liquids or gases) decreases the volume of the object and thus increases its density via the atomic number density. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. The chemical symbol for Radon is Rn. Tungsten is an intrinsically brittle and hard material, making it difficult to work. 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