Halogens have 7 valence electrons. Halogens are the group (vertical column) of elements on the Periodic Table that lie 2nd from the from right side. They sit next to the noble gases, which have 8 valence electrons (except helium, which only has an S shell, and therefore 2 total electrons.) The rule of thumb (which doesn't apply to the transition metals in the middle) is such that every time you move left of the noble gases, you lose 1 valence electron. Halogens, being 1 group to the left, have 7. If you move left again, you reach Oxygen (group 16), which only has 6. Move left again, you have Nitrogen (group 15), which have 5. Left again, you have Carbon (group 14) which has 4, Which is why Carbon almost always forms 4 bonds. You can't generalize about the transition metals, in the middle, but if you go all the way to the Left side of the table, as in group 1, (Na or sodium, K or potassium) you have 1 valence electron. The second column (calcium, Ca, Magnesium, Mg) has 2 valence electrons.
Halogens have 7 valence electrons.
A fluorine atom has seven valence electrons, as do all halogens.
Iodine has 7 valence electrons. It is in Group 17 of the periodic table, also known as the halogens, which have 7 valence electrons.
Fluorine is the element that has 7 valence electrons.
Halogens are all non-metals, they are all very reactive, and they are all colorful.
Halogens have 7 valence electrons.
Halides have 7 valence electrons, but the halide ion, haven gained an electron has 8 valence electrons
Halogens each have 7 valence electrons.
The number of electrons are different from one to another, however all of them have seven electrons in the valence shell.
The groups of electrons with 7 valence electrons are groups 7 and 17 on the periodic table.
A fluorine atom has seven valence electrons, as do all halogens.
There are 7 valence electrons in elements of group-17. They are called halogens.
Halogens are group 17 elements. They have 7 valence electrons.
Both iodine and chlorine are halogens (group 17) and have 7 valence electrons.
No. Alkali metals have one valence electrons. Halogens have 7 valence electrons.
7 electrons are on the outer (valence) shells of all halogens
Halogens