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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.
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How many valence electrons halogens?
Halogens have 7 valence electrons.
How many valence elctrons does a fluorine atom have?
A fluorine atom has seven valence electrons, as do all halogens.
What is the number of valence electrons of iodine?
Iodine has 7 valence electrons. It is in Group 17 of the periodic table, also known as the halogens, which have 7 valence electrons.
What element have 7 valence electrons?
Fluorine is the element that has 7 valence electrons.
Which property is common to all halogens?
Halogens are all non-metals, they are all very reactive, and they are all colorful.
How many valence electrons halogens?
Halogens have 7 valence electrons.
How many valence electrons do halogens gave?
Halides have 7 valence electrons, but the halide ion, haven gained an electron has 8 valence electrons
How many valence electron does halogen have?
Halogens each have 7 valence electrons.
How many valence electrons do Halogens have?
The number of electrons are different from one to another, however all of them have seven electrons in the valence shell.
Which group of elements 7 valence electrons?
The groups of electrons with 7 valence electrons are groups 7 and 17 on the periodic table.
How many valence elctrons does a fluorine atom have?
A fluorine atom has seven valence electrons, as do all halogens.
How many valence electrons do elements group 17 have?
There are 7 valence electrons in elements of group-17. They are called halogens.
How many valance electrons does halogen have?
Halogens are group 17 elements. They have 7 valence electrons.
How many electrons would be in the valence shells of iodine and chlorine?
Both iodine and chlorine are halogens (group 17) and have 7 valence electrons.
Do alkali metals contain 7 valence electrons?
No. Alkali metals have one valence electrons. Halogens have 7 valence electrons.
How many electrons are in the outer electron level of the halogen?
7 electrons are on the outer (valence) shells of all halogens
What is the number of valence electrons of iodine?
Iodine has 7 valence electrons. It is in Group 17 of the periodic table, also known as the halogens, which have 7 valence electrons.
