Protactinium is a chemical element; it has symbol Pa and atomic number 91. It is a dense, radioactive, silvery-gray actinide metal which readily reacts with oxygen, water vapor, and inorganic acids.

镤 pú （英語： Protactinium；舊譯 鎃[4]），是一種 化學元素，其 化學符號 为 Pa， 原子序數 为91， 原子量 為 231.035 88 u，属于 锕系元素，具有 放射性。 鏷是一种银灰色、 密度 大的 金属，容易与 氧 、 水蒸汽 和无机 酸 反应。 鏷在化合物中的 氧化態 主要是+5，但也存在+4和更加罕見的+3及+2氧化態。 鏷是在1913年由 卡西米爾·法揚斯 和 奥斯瓦尔德·格林 （西班牙语：Oswald Helmuth Göhring） 發現，並將其命名為“brevium”（拉丁语，意為短暂、短期），因為當時發 …

Elements are organised into blocks by the orbital type in which the outer electrons are found. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). The arrangements of …

Protactinium is a rare, poisonous and expensive element that is present in uranium ores in very small amounts. In 1961, the Great Britain Atomic Energy Authority was able to produce 125 grams of 99.9% pure protactinium, although they had to process about 55,000 kilograms of ore and spend about $500,000 to get it.

2019年8月2日 · Protactinium is a radioactive element predicted to exist in 1871 by Mendeleev, although it was not discovered until 1917 or isolated until 1934. The element has atomic number 91 and element symbol Pa. Like most elements on …

Protactinium is one of the rarest naturally occurring elements. Two isotopes of protactinium Pa-231 and Pa-234 occur naturally. Pa-231 is the most abundant naturally occurring isotope. Protactinium is found in uraninite ore (uraninite is a uranium rich ore). Both isotopes of protactinium are a decay product of different isotopes of uranium.

Protactinium (Pa), radioactive chemical element of the actinoid series of the periodic table, rarer than radium; its atomic number is 91. It occurs in all uranium ores to the extent of 0.34 part per million of uranium. Its existence was predicted by Russian chemist Dmitry Mendeleyev in his 1871

2021年10月14日 · Protactinium atom is an actinoid atom and a f-block element atom. Protactinium has been reported in Paris polyphylla var. chinensis with data available. A radioactive element of the actinide group of metals. It has the atomic symbol Pa, atomic number 91, and atomic weight 231. It decays by alpha-emission. Pa.

Protactinium is a chemical element of the periodic table with chemical symbol Pa and atomic number 91 with an atomic weight of 231.036 u and is classed as a actinide.

Protactinium is a highly radioactive metal belonging to the family of actinides and denoted by the chemical symbol Pa [1]. It has 27 isotopes with mass numbers ranging from 212 to 238 out of which protactinium-231 is the most stable one with a half-life of 3.276 x 10 4 years.