WebIsotopes with an even number of both protons and neutrons are generally stable. True A radioactive decay reaction produces a simpler, more stable nucleus. True An alpha particle is really a high-energy electron ejected from the nucleus. False This type of radiation is really the nucleus of a helium atom. alpha WebHelium 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 Helium is He. ... It is a synthetic element (first synthesised at Hasse in Germany) and radioactive. The most stable known isotope, 269 Hs, has a half-life of approximately 9.7 seconds.

Nuclear Magic Numbers - Chemistry LibreTexts

WebJan 27, 2015 · Helium is a noble gas, a group of nonreactive and stable gases that also include neon, argon, krypton, xenon and radon. As of 2010, it took 300,000 cubic feet of helium to float the 15 character ... WebAnswer (1 of 5): Because of quantum physics, the strong force, and relatively weaker Coulomb repulsion. More stable isotopes are more tightly bound, that is their binding energies are higher. Helium has two stable isotopes, He-3 and He-4. He-4 is the more strongly bound isotope. Because of its s... medication aide practice exam

Helium - Wikipedia

Web1 day ago · radioactive sustances have unstable nuclei that undergo random, spontaneous nuclear decay. which of the following is an unstable isotope? A. oxygen B. helium C. carbon D. tritium WebNuclear chemistry is the study of reactions that involve changes in nuclear structure. The chapter on atoms, molecules, and ions introduced the basic idea of nuclear structure, that the nucleus of an atom is composed of protons and, with the exception of 1 1 H, 1 1 H, neutrons. Recall that the number of protons in the nucleus is called the atomic number (Z) … WebMay 5, 2014 · Explanation: There are nine known isotopes of helium. They range from helium-2 to helium-10. Only helium-3 and helium-4 are stable. All the radioisotopes are short-lived. The longest-lived is helium-6, with a half-life of 810 ms. The least stable isotope is helium-5, with a half-life of 7.6×10⁻²² s. Helium-2 may have an even shorter half-life. medication aide online training