Definition of Np Neptunium (Np) is a chemical element with the symbol Np and atomic number 93 in the periodic table. It is the first man-made chemical element, hence it does not naturally occur on Earth. 1.1 Names 1.1.1 Common name: Neptunium 1.1.2 English name: Neptunium 1.2. Atomic number: 93 1.3. Atomic mass: 237 1.4 … Read more
Definition of U Uranium (U) is a chemical element with the symbol U and atomic number 92 in the periodic table. It was discovered by German scientist Martin Heinrich Klaproth in 1789. 1.1 Names 1.1.1 Common name: Uranium 1.1.2 English name: Uranium 1.2 Atomic number: 92 1.3 Atomic weight: 238.03 1.3.1 Molecular structure: Uranium is … Read more
Definition of Pa Pa is the symbol for the chemical element Protactinium, which belongs to the Actinide group, period 7 in the periodic table of chemical elements. 1.1 Names 1.1.1 Common name: Protactinium 1.1.2 English name: Protactinium 1.2 Atomic mass: 231 1.3 Atomic weight: 231.03588(2) u 1.3.1 Molecular structure: Pa belongs to the type of … Read more
In fact, which chemical are you referring to as “Th”? The information you provided is not sufficient for me to write a chemistry introduction. I need to know what “Th” is. If Th is Thorium, a chemical element in the periodic table with symbol Th and atomic number 90, here are the basic facts. Definition … Read more
Definition of Acid Acid is a chemical substance that exists in nature or is produced by humans. Acid can be solid, liquid, or gas, depending on temperature and pressure conditions. Acid often has a distinctive smell, turns litmus paper from blue to red, and can activate H+ ions in solution. 1.1 Names 1.1.1 Common name: … Read more
Definition of Ra Ra (Radium) is a chemical element with the symbol Ra and atomic number 88. Ra belongs to the alkaline earth metals group in the periodic table. 1.1 Names 1.1.1 Common name: Radium 1.1.2 English name: Radium 1.2. Atomic number: 88 1.3. Atomic mass: Approximately 226 1.3.1 Molecular structure: Ra does not usually … Read more
Definition of Fr Francium, also known in English as Francium, belongs to the 7th period of the periodic table, group 1 (alkali). The atomic mass of Fr is 223 and the atomic mass unit is 223 atomic mass units (u). Francium has a simple molecular structure, mainly single Fr atoms. The main ion structure is … Read more
Definition of Rn Rn is the chemical symbol of Radon, a nonmetal element, the 86th chemical element in the periodic table. Radon belongs to the group of noble gases, primarily derived from the decay of Uranium and Thorium in the Earth’s crust. 1.1 Names 1.1.1 Common name: Radon 1.1.2 English name: Radon 1.2. Atomic mass: … Read more
Provide 5 examples [if any] Application of At Present the applications of At in society, economy, medicine, manufacturing, engineering, environment, etc. Safety when working with At Remind students about the safety rules when practicing chemistry with At. For each specific chemical, the teacher can fill appropriate information into the above template. For example, if the … Read more
Definition of Po Polonium (Po) is known to be a chemical element with the symbol Po and atomic number 84. It was discovered by Marie and Pierre Curie in 1898, and named after Marie’s homeland, Poland. Polonium belongs to the chalcogen group like oxygen, sulfur, selenium, tellurium, and livermorium. 1.1 Names 1.1.1 Common Name Polonium … Read more