Beryllium has how many valence electrons in its last ring?

1 Answer
Stefan V.
Jan 9, 2015

Beryllium is located in both the second group, and the second row of the periodic table, which gives it an atomic number of 4 and a total number of 4 electrons. Its electron configuration is

#"Be":1s^(2)2s^(2)#, or using the noble gas shorthand notation,

#"Be":["He"]2s^(2)#

Valence electrons are defined as the electrons capable of forming chemical bonds with other atoms, and are lcoated in the outermost shell of the atom. As its electron configuration shows, #"Be"# has 2 valence electrons located in the 2s subshell.

These electrons give #"Be"# a +2 oxidation state and the ability to form 2 covalent bonds.

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