Helium

Helium is a chemical element. It has the chemical symbol He, atomic number 2, and atomic weight of about 4.002602. There are 9 isotopes of helium, only...

Helium-3 (3He) is a light, stable isotope of helium. It has two protons and one neutron. Helium-3 was discovered in 1939. Helium-3 occurs as a primordial...

Helium-4 (also written 4He) is an isotope of helium. It is the most common isotope of helium in the universe. Out of all the helium on the Earth, 99.99986%...

periodic table. There are only two elements in the first period: hydrogen and helium. We can explain why there are less elements in the first row in modern theories...

another proton to make a helium-3 nucleus. Finally, two helium-3 nuclei collide. This releases two protons and creates a stable helium-4 nucleus. More massive...

Helium is discovered. Louisa May Alcott's novel Little Women is published. Meiji Restoration in Japan. Francisco Carreón...

Mercury, Venus and possibly the Earth. All new stars change hydrogen to helium through nuclear fusion. This makes a lot of energy (e.g. light and heat)...

conductors of heat and electricity. Some are gases including: hydrogen, helium, oxygen, nitrogen, fluorine, neon or radon and others. An example of a solid...

The atmosphere of Uranus is mainly made up of hydrogen and helium. The lower atmosphere is made up of volatiles such as water, ammonia and methane. The...

are heavier than hydrogen and helium. Most of the normal physical matter in the Universe is either hydrogen or helium. Astronomers use the word "metals"...

physicist. He was known for his works on sub-millikelvin temperature studies of helium-3. He won the 1996 Nobel Prize in Physics. "Biography". Nobel Foundation...

just 40. Helium is rare and expensive, so the airship was also modified to not leak helium. However, the United States refused to sell any helium to Germany...

experimental condensed matter physics and for his co-discovery of superfluidity in Helium-3. He shared the 1996 Nobel Prize in Physics along with David Lee and Robert...

have a full 8 electrons outer electron shell. There are six noble gases: helium neon argon krypton xenon radon All of these gases are found in air. They...

family) Group 17: the halogens (fluorine family) Group 18: the noble gases (helium/neon family) See Alkali metal The most reactive metals are Lithium (Li)...

Oxidizing Helium or Neon takes a lot of energy. No chemical substance is known to have enough power to oxidize Helium or Neon. Two Helium compounds have...

Richardson and Douglas Osheroff for their discovery of superfluidity in helium-3. Lee is professor emeritus of physics at Cornell University and distinguished...

Berkelium was first made by hitting americium with alpha particles or helium ions. It is named after Berkeley, California and the University of California...

make many colors when Noble gasses are inside of the bulb. For example, helium would give a light yellow color and neon would make a red or orange color...

giant is a huge planet made mostly of elements heavier than hydrogen and helium, such as oxygen, carbon, nitrogen, and sulfur. There are two known ice giants...