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
Mercury has two valence electrons, both of which sit in the atom's 6s shell. A valence electron is an electron in the outermost shell of an atom. Valence electrons are capable of bonding with the valence electrons of other atoms to form a compound.Full Answer >
Gallium has three valence electrons. One can find this by looking at the electron configuration, which is Ga:[Ar] 4s2 3d10 4p1. In a chemical reaction, one can lose the electrons in the 4s and 4p subshell, and the total number of electrons in these subshells is three.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 >
Zirconium has four valance electrons, with two in the 4d level and two in the 5s level. This allows it to combine with other elements and ions in different configurations. It has valence charges of +2, +3 and +4.Full Answer >