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the reactivity of depends on the number of its outer shell electrons. one all outer shell electrons are there then there is little reactivity. If the atomic number is 19 then the element will 19 protons and 19 electrons. this means it has 2 electrons in the 1st shell 8 in the second 8 in the 3rd and 1 in the last. as it only has one it will be very reactive =)

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Q: How do you determine how reactive an element is based off its atomic number?
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Which particle determines the atomic number of an element?

The atomic number of an element is determined by the number of protons.


Which mass number or atomic number determine what element an atom is?

The identity of the element is determined solely by the atomic number, which is the number of protons.


What element is the most reactive in the periodic table?

Fluorine is the most reactive non metal.Caesium is most reactive metal in the table.Fluorine has atomic number 9.


Is Fluorine is the most reactive element in the halogen family.?

Yes,Fluorine is the most reactive non metal.It has atomic number of 9.It is the lightest Halogen.


Fluorine is the most reactive element in the halogen family.?

Yes,Fluorine is the most reactive non metal.It has atomic number of 9.It is the lightest Halogen.

Related questions

Which particle determines the atomic number of an element?

The atomic number of an element is determined by the number of protons.


Which mass number or atomic number determine what element an atom is?

The identity of the element is determined solely by the atomic number, which is the number of protons.


How do you determine neutrons in element?

subtract the atomic number from the mass number


What element is the most reactive in the periodic table?

Fluorine is the most reactive non metal.Caesium is most reactive metal in the table.Fluorine has atomic number 9.


What are the most reactive elements?

That would be the element with the highest atomic number but the lowest number of valence electrons.


Is the element determine by the number of protons?

The atomic number is equal to the number of protons.


Is vanaduim reactive?

Vanadium is a chemical element with the symbol V and an atomic number of 23. It is moderately reactive and only becomes more reactive with hot acids.


Has an atomic number of 7?

Could you please re-ask your question in a better manner, because that question does not make sense. Are you trying to ask the atomic mass of the element with the atomic number of 7? or are you just stating that there is an element with the atomic number of 7? because that is not a very good question.


Determine the number of protons?

The number of protons is equal to atomic number and the number of electrons (for a neutral atom).


What do the protons do?

The number of protons determine the atomic number of an element. There are the same amount of protons as electrons in a regular element.


What is Ba atomic number?

Atomic Number is 47; Atomic Mass is 137.3; Element Name is Barium; Classified as the Alkaline Earth Metals.


Do electrons determine what kind of element an atom is?

The number of protons determine the element. It is equal to the atomic number. The number of electrons is equal to the number of protons only of the atom is neutral.