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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 elctrons does a fluorine atom have?
A fluorine atom has seven valence electrons, as do all halogens.
What atoms have seven electrons in their outermost energy levels?
All halogens (fluorine, chlorine, bromine, iodine and astatine) have 7 valence electrons.
What has 7 valence electrons in the periodic table?
halogens
What is the metalloid with 7 valence electrons?
halogens
What is similar with bromine and the rest of the halogens?
They 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.
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 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.
What group of elements has seven valence electrons?
The name of the family is the Halogen family.
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 Halogens have?
The number of electrons are different from one to another, however all of them have seven electrons in the valence shell.
Do alkali metals contain 7 valence electrons?
No. Alkali metals have one valence electrons. Halogens 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.
What atoms have seven electrons in their outermost energy levels?
All halogens (fluorine, chlorine, bromine, iodine and astatine) have 7 valence electrons.
Group of elements with 7 valence electrons?
Halogens
