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Fluorine = 9

Chlorine = 17

Bromine = 35

Iodine = 53

Astatine = 85

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Related Questions

What is the reactivity for the halogens?

The reactivity of halogens decreases with increasing atomic number.


What is the relation between the halogens and their atomic numbers?

The halogens are a group of elements in the periodic table that includes fluorine, chlorine, bromine, iodine, and astatine. They are located in Group 17, and their atomic numbers increase across the period from fluorine (atomic number 9) to astatine (atomic number 85). This means that each halogen element in this group has one more proton in its nucleus compared to the previous element, resulting in an increase in atomic number.


What is halogens atomic number?

The halogens are located on the left of the noble gases on the periodic table. These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).


What trends the periodic table should be expected as the atomic number decreases in the halogens?

Halogens with lower atomic number are more reactive and less dense. Also iodine is solid, bromine liquid and the first halogens are gases.


What are some names of halogens?

blop


Do the halogens have different numbers of valence electrons?

no, but lower halogens have different oxidation states.


What is the difference between the atomic number and the valence number of an atom?

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What happens to the reactivity of halogens as you go down the group?

the reactivity of halogens goes on decreasing as we go down the group, because of increasing in atomic size of the respective element.


What element has the atomic number for 3.14?

No element has this atomic number. All atomic numbers are whole numbers.


If an element of atomic number 118 is ever synthesized what properties might you expect it to have?

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What are the halogens from the lowest to highest atomic number?

Fluorine, chlorine, bromine, iodine, astatine (ununseptium?)


What is the difference between the atomic number of an element and the number of valence electrons?

Describe the reactivity of halogens