The halogens, or group 17
The name of the family is the Halogen family.
Any element in the halogen group will have seven valence electrons. These elements include fluorine, chlorine, bromine, iodine, and astatine.
halogens such as flourine, chlorine, bromine..
The most reactive elements have either 1 valence electron or 7 valence electrons
Group 2 metals have 2 valence electrons. In fact, the number of valence electrons of elements can be deduced from the group number (e.g. group VII elements have 7 valence electrons).
How many valence electrons do transition elements have?
The most reactive elements require to lose or gain the least number electron(s) to attain a noble gas structure. These are elements in group one as they need to lose one electron, and elements in group seven as they need to gain one electron.
The group of the element indicates the amount of valence electrons. For example, the alkali metals have one valence electron and is in group one whilst the halogens have seven valence electrons and are in group seven.
the element with seven valence electrons will be more reactive. The reason for this is that elements want to always want to have a full valence shell (they always want 8, like a noble gas). The element with eight valence electron is happy with its full shell and will not want to get rid of any electrons.
Elements in the same group have the same number of valence electrons. These are the outer-shell electrons that react with other elements.
Elements in the same group have the same number of valence electrons.
Halogen family members, or elements in group 17, have 7 valence electrons.