Twenty-two isotopes of technetium are reported, all of which are radioactive. It has three long-lived radioactive isotopes, but the most useful isotope has a short half-life that makes it useful for many medical tests. It likely exists in natural uranium deposits, the result of neutron captures and beta decays, but hasn’t been detected yet. Curium metal is silver, malleable, chemically reactive, and electropositive. It also rapidly oxidises in air. Curium’s compounds and solutions are stable and faint yellow or greenish yellow.

Periodic Table of Elements, Made In Engineered Labs Heritage Periodic Table of Elements, Made In

Groups are the vertical columns on the periodic table. There are total 18 vertical columns on periodic table. Hence there are 18 groups. The existence of promethium was predicted in 1902 and confirmed in 1914, though searches for it on earth have been unsuccessful. Used where corrosive agents are needed, zirconium is a component in vacuum tubes, alloying agents, surgical appliances, photoflash bulbs, explosive primers, rayon spinnerets, and lamp filaments.Neon is very inert, but a fluorine-neon compound has been reported. It also forms an unstable hydrate. Neon has more refrigerating capacity per volume than liquid helium and more than triple that of liquid hydrogen. The metal is silvery white and very hard, although softer and more ductile than tungsten. Used as an alloying agent, it makes quenched and tempered steels both harder and tougher and improves their strength at high temperatures. Molybdenum oxidises at elevated temperatures.

Periodic Table with Real Elements Inside, Real Original Periodic Table with Real Elements Inside, Real

Hafnium is a ductile metal with a brilliant silver lustre and is very difficult to separate. Resistant to concentrated alkalis, it reacts at elevated temperatures with oxygen, nitrogen, carbon, boron, sulfur, and silicon, and directly with halogens to form tetrahalides. The metal’s spectrum contains two bright blue lines and several others in red, yellow, and green wavelengths. Pure vanadium is a soft, ductile, and bright white metal with good structural strength and corrosion resistance to alkalis, sulfuric and hydrochloric acids, and salt water. This element has a bright metallic lustre and is relatively stable at room temperature. Dysprosium can be cut with a knife and machined without sparking if not overheated. Minute impurities can significantly affect its physical properties.

Lanthanides

Ultra-pure gallium is silvery, and the solid metal fractures somewhat like glass. It is used in low-melting alloys with most metals. Because Gallium expands as it solidifies it should be stored in a flexible container. In nature, chlorine is found only in a combined state, mostly as common salt (NaCl), carnallite, and sylvite. A greenish-yellow gas, it combines with nearly all elements. Chlorine gas is a respiratory irritant and prolonged exposure can be fatal. In a mixture, the two ingredients can be separated using physical processes, without chemical reactions. This is because they are not chemically bonded together.