Selenium is a group 16 element. It has 6 electrons in its valence shell and simply on that basis would be predicted to be divalent. and that is found to be true with compounds such as H2Se, However like sulfur it is capable of other valencies.
It can be tetravalent, examples are SeO2 (which is chain polymer) and SeF4.
It can also be hexavalent in SeF6, an octahedral molecular compound.
And it can appear to be monovalent in for example Se2Cl2 which is actually Cl-Se-Se-Cl.
2,4,6
6 valence electrons
Selenium has 6 electrons in its outermost shell.
6
4s2 4p4
They both have 6 valence electrons. Oxygen and Selenium are in the same group.
Selenium has 6 valence electrons
6 valence electrons
Selenium has 6 electrons in its outermost shell.
Six valence electrons
yes, an oxygen atom have the same number of valence electrons as a selenium atom.
6 valence electrons
No, Selenium has 6 valence electrons while Bromine has 7. You can determine this because on the periodic table, Selenium is in Group VI while Bromine is in group VII.
6
6
4s2 4p4
Selenium
6 valence electrons