WebAstatine is a chemical element with atomic number 85 which means there are 85 protons in its nucleus. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. WebStrontium-90, a radioactive isotope, is a by-product of nuclear reactors and present in nuclear fallout. It has a half-life of 28 years. It is absorbed by bone tissue instead of calcium and can destroy bone marrow and cause cancer. However, it is also useful as it is one of the best high-energy beta-emitters known.
What group has 7 electrons in its outer energy level?
WebMar 23, 2024 · Astatine (At) 7: 86: Radon (Rn) 8: 87: Francium (Fr) 1: 88: Radium (Ra) 2: 89: Actinium (Ac) 3: ... WebAug 2, 2024 · Depending on who you ask, there are either 5 or 6 halogens. Fluorine, chlorine, bromine, iodine, and astatine definitely are halogens. Element 117, tennessine, might have some properties in common with … react build github pages
Group 17: General Properties of Halogens - Chemistry LibreTexts
WebAug 21, 2024 · Astatine - Astatine is a radioactive element with an atomic number of 85 and symbol At. Its possible oxidation states include: -1, +1, 3, 5 and 7. It is the only halogen that is not a diatomic molecule and it appears as a black, metallic solid at room temperature. Astatine is a very rare element, so there is not that much known about this element. WebAtomic Number: 83 Atomic Mass: 208.98038 amu Melting Point: 271.3 °C (544.45 K, 520.33997 °F) Boiling Point: 1560.0 °C (1833.15 K, 2840.0 °F) Number of Protons/Electrons: 83 Number of Neutrons: 126 Classification: … WebApr 5, 2024 · Protons have a positive electrical charge of one (1+) and a mass of about 1 atomic mass unit (1 amu). Together with neutrons, they make up virtually all of the mass of an atom. ⚖️ Atomic Mass Units. An atomic mass unit (amu) is defined as one-twelfth of the mass of a carbon-12 atom, which is about 1.660 × 10 −27 kg. Atomic mass units ... react build gzip