In general, the electronic structure of the valence electrons of halogens is given by: ns2, np5
where n is the period in which the halogen is found.
Since the valence electrons are found in both s and p orbitals which have slightly different energies, the valence electrons of halogens are not in orbitals of the same energy level.
The word "valance" is used to describe electrons in the outer-most energy level of an atom. Oxygen has six valance electrons.
What causes these to be so reactive is the amount of electrons in the outer most level. Each level after the first (which has 2 if full) if filled will have 8 electrons. Halogens have less than that causing it to be reactive to other elements. (i don't know how many electrons it has in the outer level) The reason why it is reactive is (depending on how many electrons it has in the outer leve) because it is either trying to gain or lose those extra electrons. What causes these to be so reactive is the amount of electrons in the outer most level. Each level after the first (which has 2 if full) if filled will have 8 electrons. Halogens have less than that causing it to be reactive to other elements. (i don't know how many electrons it has in the outer level) The reason why it is reactive is (depending on how many electrons it has in the outer leve) because it is either trying to gain or lose those extra electrons.
The second energy level contains eight valance electrons when it's full.
halogens (group 17 elements)
Halogens
A halogen is located in group 17 of the periodic table, so the electron configuration for the valance electron would be ns2np5 (n=energy level). So all halogens have 7 valance electrons.
The electrons in the outermost level are known as the valence electrons.
The word "valance" is used to describe electrons in the outer-most energy level of an atom. Oxygen has six valance electrons.
Halogens have six valence electrons in the outermost energy level.
valance
The valance energy level contains 4 electrons in carbon.
What causes these to be so reactive is the amount of electrons in the outer most level. Each level after the first (which has 2 if full) if filled will have 8 electrons. Halogens have less than that causing it to be reactive to other elements. (i don't know how many electrons it has in the outer level) The reason why it is reactive is (depending on how many electrons it has in the outer leve) because it is either trying to gain or lose those extra electrons. What causes these to be so reactive is the amount of electrons in the outer most level. Each level after the first (which has 2 if full) if filled will have 8 electrons. Halogens have less than that causing it to be reactive to other elements. (i don't know how many electrons it has in the outer level) The reason why it is reactive is (depending on how many electrons it has in the outer leve) because it is either trying to gain or lose those extra electrons.
The halogens have 7 electrons in their outer shell desparate to gain the 1 electron to make a full shell of 8 electrons.
The second energy level contains eight valance electrons when it's full.
7 electrons are on the outer (valence) shells of all halogens
valence electrons are the remaining electrons after which an atom has attains its octate level
4 energy levels with 2, 8, 8, 2 electrons in the energy levels.