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Answered 2011-12-12 23:17:43

It represents the group it belongs to in the periodic table.

Valence electrons are the electrons from the last ring.

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You can determine how many valence electrons an atom has by what family the element of the atom is in. For instance, if the element is in family 8A, the number of valence electrons will be 8. Or, if the element is in family 2A, the number of valence electrons for the atom will be 2. So, whatever number family the atom is in, the number of valence electrons equals that.



The number of core electrons is: total number of electrons - number of valence electrons


valence electrons is the same as the number as the last digit in the group :)


The electrons in the outermost shell of an atom is known as the valence electrons. These valence electrons determine the reactivity of the atom.


The number of electrons determine how many other atoms the atom will interact with.



In the neutral atom of a chemical element number of electrons= number of protons=atomic number.


Because charge only reveals the number of valence electrons of an atom while the identity of an atom also relies on the number of non-valence electrons.


Valence shell electrons or valence electrons determine the chemical properties of an atom...


how does the number of valence electrons affect the reactive of an atom


When an atom holds less valence electrons, it is less stable and is not likely to react. Also, the number of valence electrons can determine the ways in which the atom can bond with other atoms.


Electrons in the outermost energy level are called valence electrons. The number of valence electrons on an atom largely determine its behavior and characteristics.


A calcium atom has two valence electrons.


The most valence electrons an atom can contain is eight.



yes, an oxygen atom have the same number of valence electrons as a selenium atom.


using the periodic table, count across a period (row) to find the number of valence electrons


Valence electrons are: In chemistry, those electrons found in orbits farthest from the nucleus of the atom. These electrons determine the way in which the atom will combine with other atoms, and thus determine its chemical properties.


In a periodic tabe,the elements have certain electrons in their outermost shell. These electrons are also called as valence electrons. Therefore,with the help of periodic table,you can determine how many valence electrons an atom has. :)


you round the atomic mass then subtract the atomic number


Valence electrons can determine the reactivity of the atom. An atom with a full shell of valence electrons, like neon, will be less reactive than an atom with only one electron in its valence shell, like sodium.


To find the number of valence electrons in an atom of a representative element, all you have to do is look at its group number. Ex: Group 1 (Hydrogen, Lithium, Sodium, Potassium, ect.) All have 1 valence electron.


The number of valence electrons and the types of free orbitals in the valence shell determine the number of bonds for an atom.


Valence electrons are the number of electrons in the outermost shell of an atom. These are the electrons that will react to form compounds. To determine the number of valence electrons, one must look at the group numbers on the periodic table. Group 1A will have 1 valence electron, 2A = 2 valence electrons, 3A = 3 valence electrons, etc. When an atom has reached 8 valence electrons (noble gases), it is no longer reactive. That should help. c:



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