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First, find the element on the Periodic Table of Elements, which is arranged in convenient columns. There are 8 numbered columns, and everyting in column one has one valence electron, everything in column two has two valence electrons, and so forth; column eight is an exception because eight valence electrons really means none (since valences operate on the principle of every atom reacting in a way that will give it eight electrons, either all its own or shared). However, not all elements are in these numbered columns. There are also the transition state elements. Those elements have several possible valences, due to the complexity of their electron shells, in which some of the electrons in the inner shells participate in chemical reactions, as well as the usual outer electrons. But they are all metals, hence, they are going to have valences of either 1, 2, or 3. There are also the noble metals which have effectively a valence of zero, like the noble gases in column 8. Hope this isn't too complicated.
Wiki User
∙ 14y ago
Wiki User
∙ 15y agothe group in which an element falls = # of valence electrons
eg Na gp 1 = 1 valence e
Ca, gp 2 = 2 valence e and so on.......
the number of covalent bond an element makes really depends on which other element it bonds with but note this
a covalent bond consist of 2 electrons so how many covalent bonds formed will depend on how many electrons an atom has in its valence shell
- covalent bond are mostly between non metals and involves electron sharing
carbon forms the longest chain of covalent bonds with itself...
Wiki User
∙ 14y agoThe amount of valence electrons in an atom of an element is the amount of electrons placed at the outermost ring of the atom.
http://www.electronics-microcontroller.com/electronics-articles-basic-Structure-of-the-Atom.htm
Wiki User
∙ 13y agoLook at their Atomic Valence Shell Diagrams.
When an Atom resides in the first column, like Na, it has 'a valence of +1'. If it is in the 2nd column like Mg, 2 valence electrons. If its in the middle part, you probably don't have to worry about it yet. If its in the column with B (Boron), 3 valence electrons. In the column with Carbon (C) four valence electrons. In the column with P (Phosphorus), 5 valence electrons. In the Column with O (Oxygen) 6 valence electrons. The column with F (Fluorine) has 7 valence electrons. The column on the very end has a full shell of valence electrons so they dont/rarely ever react.
Wiki User
∙ 13y agoif it isn't an ion (electrically charged) it should be the same as the atomic number (number above the atomic symbol)
for example, Carbon has 6 electrons, because it has an atomic number of 6.
Wiki User
∙ 14y agoEach elements valence electron on the periodic table matches the group number it is in. =) Hope this helps Ex. Na Group 1A has 1 valance electron
Wiki User
∙ 16y agoThe number of valence electrons is equal to their GROUP NUMBER, example: Mg is in IIA, therefore, it has 2 valence electrons... Br is in VIIA,therefore, it has 7 valence electrons
Wiki User
∙ 11y agoyou can tell by looking at the columns for example hydrogen is in column 1 so it has 1 valence electrons i know this because i learned it.
Wiki User
∙ 13y agoSimply look at the periodic table. The number of valence electrons is the same as the group number. Ex: Boron has 3, Carbon has 4, Nitrogen has 5..
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What is the relationship between an element's number of valence electrons and its reactivity?
When we say valence electron we mean the number of electron left it the outermost shell of element, valence electron can be positive of negetive. If an element need much electrons to be octet, that means that the element is not reactive than the one who will give out electrons, the the one who can give electrons much are less reactive than the one who can give a litle and the reaction will be normal as it is soppused to be, Eg lithium and berylium. Lithium is more reactive than berylium because lithuin has 1valence electron while berylium has 2....reactivity goes with the action of valence electron in an element
What element is most reactive an en element with 7 valence electrons or an element with 8 valence electrons?
the element with seven valence electrons will be more reactive. The reason for this is that elements want to always want to have a full valence shell (they always want 8, like a noble gas). The element with eight valence electron is happy with its full shell and will not want to get rid of any electrons.
Which element has the same valence electron configuration as phosphorus?
Pretty much any element in group 15 (N, P, As) will have 2 "s" electrons and 3 "p" electrons in their valence shells, it's just that they will at different energy levels. For example, N is 2s2 2p3 and P is 3s2 3p3.
What is the valency of Indium?
Indium has 3 valence electrons. The electronic configuration for indium (In) which has 49 electrons will end up as:[Kr] (5s^2) (4d^6) (5p^1)The 5s and 5p are the largest valence electron n{n=5} by summing the Powers (2) + (1) = 3 Valence electron.
How many additional valence electrons does fluorine need to have a full valence?
I believe you are talking about fluorine. If you are, F needs one more electron to gain a full shell.If you go to WikiAnswers for this information, that is counterproductive, because there is a much better way to do it. Look at the periodic table. Groups IA through VIIIA tell you what you need to know. IA has one valence electron, IIA has two valence electrons etc. Fluorine is in group VIIA and therefore has seven valence electrons. All atoms want eight, and thus fluorine is in need of one more.
What is the relationship between an element's number of valence electrons and its reactivity?
When we say valence electron we mean the number of electron left it the outermost shell of element, valence electron can be positive of negetive. If an element need much electrons to be octet, that means that the element is not reactive than the one who will give out electrons, the the one who can give electrons much are less reactive than the one who can give a litle and the reaction will be normal as it is soppused to be, Eg lithium and berylium. Lithium is more reactive than berylium because lithuin has 1valence electron while berylium has 2....reactivity goes with the action of valence electron in an element
What element is most reactive an en element with 7 valence electrons or an element with 8 valence electrons?
the element with seven valence electrons will be more reactive. The reason for this is that elements want to always want to have a full valence shell (they always want 8, like a noble gas). The element with eight valence electron is happy with its full shell and will not want to get rid of any electrons.
Why is so much emphasis placed on valence electrons?
The valence electrons of an element are mainly what determine an element's properties.
Which element has the same valence electron configuration as phosphorus?
Pretty much any element in group 15 (N, P, As) will have 2 "s" electrons and 3 "p" electrons in their valence shells, it's just that they will at different energy levels. For example, N is 2s2 2p3 and P is 3s2 3p3.
What is the valency of Indium?
Indium has 3 valence electrons. The electronic configuration for indium (In) which has 49 electrons will end up as:[Kr] (5s^2) (4d^6) (5p^1)The 5s and 5p are the largest valence electron n{n=5} by summing the Powers (2) + (1) = 3 Valence electron.
How many additional valence electrons does fluorine need to have a full valence?
I believe you are talking about fluorine. If you are, F needs one more electron to gain a full shell.If you go to WikiAnswers for this information, that is counterproductive, because there is a much better way to do it. Look at the periodic table. Groups IA through VIIIA tell you what you need to know. IA has one valence electron, IIA has two valence electrons etc. Fluorine is in group VIIA and therefore has seven valence electrons. All atoms want eight, and thus fluorine is in need of one more.
How much valence electrons does sulfur have?
The element Sulfur has 6 valence electrons. : )
Which things determine an element's electronegativity?
the number of valence electrons in the atom's outer shell how much the valence electrons are shielded from the nucleus
Why does a potassium atom always lose its one valence electron what type of bond will it form with a chlorine atom?
A potassium atom "always" loses exactly one valence electron when it reacts with another element, because one valence electron in a potassium atom has a much lower ionization energy requirement than any other electron in the same atom. (This property is generally ascribed to the fact that when a potassium loses exactly one electron, it acquires the very stable electron configuration of the noble gas argon.) A chlorine atom has a very strong attraction (its electronegativity) for exactly one electron, which gives the charged atom the electron configuration of an argon atom. Therefore, when a potassium atom is close enough to a chlorine atom, one electron is transferred between to form an ionic bond and a formula unit of the compound potassium chloride.
Why is an element with only one electron in its outer shell very reactive?
Well, either a high amount or a low amount. Take the alkali metals for example. They all have just one valence electron and they need to lose it to fulfill the octet rule. That is what makes them so reactive; they will combine with any element in order to lose that one electron. They all have a low ionization energy, meaning it takes a relatively small amount of energy to knock off that lone electron, whereas other elements have to lose more electrons. This also applies to elements with a lot of valence shell electrons, such as fluorine which only needs one more electron to fulfill the octet rule. This is another element that will react with almost anything because it doesn't take much for it to "get what it wants".
Why did the fluorine atom 'want' to gain a valence electron?
this is because a fluorine ion is one electron short of a full valence shell,which makes getting another electron to fill the shell very favourable,filling the shell makes the molecule much more stable
How is the electron configuration of Sulfur consistent with the formation of Na2S and SF6?
Sulfur has six valence electrons and can therefore attain an inert gas configuration in two different ways: by accepting two electrons to attain the electron configuration of argon or donating or sharing six electrons to attain the electron configuration of neon. In combination with the much less electronegative element sodium, sulfur accepts one electron from each of two sodium atoms to form the ionic compound Na2S, but in combination with the more electronegative element fluorine, sulfur shares its six valence electrons with each of six fluorine atoms to form six polar covalent bonds with fluorine.
