Beryllium has five neutrons, four electrons and four protons. Its atomic number is 4, and its chemical symbol is Be. This element belongs to the second group on the periodic table, which contains the alkaline earth metals.
Beryllium has a density of 1.85 grams per cubic centimeter, and its boiling point is 4,480 degrees Fahrenheit. In nature, minerals such as beryl and emerald contain the element beryllium. However, it was not until 1828, when two chemist independently isolated beryllium from beryllium chloride, that the element was created in a pure form. In the nuclear industry, beryllium serves as an alloying agent with metals such as copper and nickel, and it is used in structural parts for space vehicles.Learn More
Lead-207 has 82 neutrons. It is a stable isotope of lead. Because it is non-radioactive, it does not have a half life. It is used in medical and scientific applications.Full Answer >
The number of neutrons in barium depends on what isotope of barium it is. The most common types of barium are barium-138 and barium-137, which have 82 and 81 neutrons respectively. Barium also has 56 protons and 56 electrons, and it has an atomic mass of 137.33 atomic mass units.Full Answer >
The number of neutrons in an atom of iron is variable, with the most common number being 30. While the number of protons is diagnostic of an atom and does not change without changing the element itself, the number of neutrons varies by isotope.Full Answer >
The nucleus of helium contains two neutrons and two protons. Around the nucleus of helium there are two electrons in the 1s orbital. These have opposite spins.Full Answer >