Helium has two valence electrons. As an element, helium is very stable and contains a single s-orbital on its outer shell.Know More
Helium is the periodic table's least reactive element, and it sits at the top of the noble gas group. In addition to being monoatomic, it has a low boiling point and is the second most common gas in the universe. It is small, light and does not react with any other elements. Helium has the following characteristics:
Helium's electron configuration is 1s^2. It has seven isotopes, and two of them are liquid. Its electron affinity is 0 kJ/mol and it has an atomic radius of 31 pm.
Natural gas deposits contain 10 percent helium, which makes them an excellent resource for extracting it. People extracting helium can obtain it from sources in Russia, Texas, Poland, Algeria, China and Canada. When liquefied, it can be used to freeze biological materials for later use. In addition, scuba divers use air that is a blend of helium and oxygen for underwater breathing. Finally, people can use helium in balloons to make them float.Learn more about Atoms & Molecules
Scandium, element 21 on the periodic table, has 2 valence electrons. Valence electrons are the electrons that occupy the highest energy orbital of an atom. They are the electrons in an atom that participate in chemical reactions.Full Answer >
Argon has eight valence electrons. Its electron configuration is 1s2 2s2p6 3s2p6, so it has three filled electron shells of 2, 8 and 8. The atomic number of argon is 18.Full Answer >
An atom of boron has three valence electrons. The valence electrons of boron occupy the second orbit around the nucleus of the boron atom. Thus, the boron atom has an electronic configuration of [He] 2s2 2p1.Full Answer >
Like all alkaline earth metals, magnesium has two valence electrons, meaning there are two electrons in its outer shell. The valence electrons are the ones that an atom shares, gains or loses when interacting with additional atoms.Full Answer >