Einsteinium

Einsteinium

Einsteinium is a special material that scientists make in labs. It is not found in nature. Its symbol is Es and it has an atomic number of 99. Einsteinium is part of a group called the actinides.

Einsteinium was first found in 1952 after a big test. The most common form, einsteinium-253, is made in powerful nuclear reactors. Only very small amounts are made, about one milligram each year, and it is hard to separate from other materials. Because there is so little of it, einsteinium is mostly used for basic science tests.

Einsteinium looks like a soft, shiny metal and glows because it is very radioactive. It is hard to study because it changes quickly into other elements.

History

Einsteinium was first found in December 1952 by Albert Ghiorso and his team at the University of California, Berkeley. They discovered it in materials from a test at Enewetak Atoll in the Pacific Ocean. The team studied the materials and found a new type of plutonium. This showed that more neutrons could be captured to make heavier elements than californium.

The discovery stayed secret until 1955 because of world tensions. The findings helped confirm ideas about how heavy elements form in space. The Berkeley team also made einsteinium in labs using nuclear reactions. They suggested naming the element after Albert Einstein. The name einsteinium (Es) was announced in 1955.

Characteristics

Einsteinium is a man-made, shiny, radioactive metal. It is found on the periodic table between the actinides californium and fermium. It has a density of 8.84 g/cm³, which is lighter than californium. Einsteinium melts at a temperature of 860 °C.

Unlike some other actinides, einsteinium is thought to have a special cube shape in its structure. However, its strong radioactivity breaks down its structure quickly, making it glow. Because samples are very tiny and hard to study, scientists heat the metal to see its properties better. Einsteinium is also very reactive.

The most stable type of einsteinium lasts for 471.7 days before it changes. All types of einsteinium are radioactive and break down fast. Because of this, einsteinium does not exist in nature and must be created in labs or nuclear reactors.

Uses

Einsteinium is mostly used for basic science experiments. In 1955, scientists used einsteinium to create a new element called mendelevium. They aimed a beam of particles at einsteinium and made 17 atoms of this new element.

A special type of einsteinium was also used on a moon probe to help scientists study the surface of the Moon. Its heavy mass helped the instruments work better.