Halogens have seven valence electrons. These seven valence electrons allow the halogen group of elements to behave in a certain way and exhibit particular characteristics.
Because they have seven electrons in their outermost shell, halogens are extremely electronegative, meaning they have a great attraction for electrons. The tendency of halogens is to fill their outermost shell with their full complement -- eight electrons.
All halogens are extremely reactive and are generally not found alone in nature. The halogen group contains elements such as fluorine and chlorine. They usually bond with extremely electropositive elements such as sodium and potassium. Electropositive elements are electron donators; they don't hold on to their electrons very well.Learn More
Helium has two valence electrons. As an element, helium is very stable and contains a single s-orbital on its outer shell.Full Answer >
Titanium has four valence electrons. Valence electrons are generally the electrons located in the outermost shell of an atom and can be gained or lost in a reaction. Valence electrons can be determined by looking at the periodic table; because titanium is four columns from the left, it has four valence electrons.Full Answer >
Oxygen has six valence electrons and is assigned a valence number of 2. This means it needs two electrons to satisfy its bonding requirements. When these two electrons come from two hydrogen atoms, the three atoms together form H2O, which is water.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 >