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Answered 2014-12-19 14:26:37

When moving down a group, the number of valence electrons do not change. This similarity yields the elements in the same groups to have same chemical properties. For example, elements in group 17 obtain one electron to stabilize as -1 ion.

In a group, all the elements have a same number of valence electrons. So their chemical properties are equal. But the physical properties vary.

Valence electrons are the electrons in outermost shell.The valence electrons remain same in a group. For example-Group-1 elements have 1 valence electron.

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Answered 2014-12-19 00:43:11

When moving down a group, the number of valence electrons do not change. This similarity yields the elements in the same groups to have same chemical properties. For example, elements in group 17 obtain one electron to stabilize as -1 ion.

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Answered 2014-12-19 05:42:01

In a group, all the elements have a same number of valence electrons. So their chemical properties are equal. But the physical properties vary.

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Answered 2014-12-19 14:26:37

Valence electrons are the electrons in outermost shell.The valence electrons remain same in a group. For example-Group-1 elements have 1 valence electron.

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Answered 2016-11-25 21:28:58

The number of valence electrons is the same.

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When moving down a group in the periodic table what does the number of valence electrons do?

When moving down a column in the periodic table, except for the first period of column 18, the number of valence electrons remains unchanged.


What happened to the number of valance electrons move from left to right on the periodic table?

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What do you notice about the number of valence electrons as you move down or up a group or column in the Periodic Table?

Moving down or up a group, you notice that the number of valence electrons remains the same. Only the principle energy level changes, increasing as one moves down the group.


What do delocalised valence electrons moving between nuclei do?

Delocalized valence electrons moving between nuclei become detached from their parent atom. The metal is held together by the strong forces of attraction between the delocalized electrons and positive nuclei.


What are valence electrons and shells?

Valence electrons are the ones which participate in chemical reactions in some way, either by moving from one atom to another, or by being shared with another atom. They are found in the outer shell of an atom (there are usually inner shells with other electrons that are not valence electrons, although in the lightest elements, there are no inner shells and all electrons are valence electrons).


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What is positive metal ions surrounded by freely moving valence electrons?

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Why are metals good conductors of heat?

Because of their many valence electrons. The free-moving electrons transmit heat quickly.


What is meant by the reactivity series of metals?

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Does ionization energy increases as you move left to right across a period?

It increases as you move to the right. This is because of the octet rule. The octet rule says that elements must combine to form 8 valence electrons. Moving to the right on a period means you are getting closer to Group 18 (noble gasses) which have 8 valence electrons. As the number of valence electrons increase it becomes harder to release an electron. Comparing it to the farthest left, metals typically are willing to give up electrons which is why the ionization energy is low. This is why first ionization energy increases as you move from left to right (metals - metalloids - non-metals) on the periodic table.


What do we call the ions surrounded by a sea of electrons?

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What is the energy of moving electrons?

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In terms of atomic structure of matter what is meant by electric current?

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What happens as you move from left to right on the periodic table the atom radius?

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Is chemical energy associated with moving electrons?

Well, as it is not possible for electrons to be stationary one could answer yes, but that isn't really correct. Chemical energy is associated with the chemical bonds that hold atoms together in molecules. Chemical bonds are produced by the valence electrons of atoms.


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Is a gold bar ionic or covalent?

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Why does salt water conduct electricity better than plain water?

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How are the elements wth in a row different?

As you move across the periodic table from left to right, the elements within a given row have their electrons in the same energy level (given by the number of the row they are in). They way they differ is by the number of electrons. Moving from left to right, the number of electrons increase.


Describe the variation of shielding effect in periodic table?

In a group in the periodic table the shielding effect increases as we move from top to bottom. This is because of the increase in the number of shells as we move further down a group or family. When a new shell is added to an element, more electrons are added and the atomic size ( radius ) increases also. The more inner-shell electrons that come in between the nucleus and the valance (outermost) shell will cause the force of attraction between between the valance electrons to be less that those that are located closer to the nucleus. The shielding effect will increase. However, when we move from left to right in a period in the periodic table, the shielding effect remains constant. This is because as we move from left to right in a period the number of valence electrons increases but no more shell are added. Since shielding effect is defined as the decrease in the force of attraction between the nucleus and the outermost (valence) shell due to the inner-shell electrons which orbit in between these two. When moving from left to right in a period more and more electrons are added in the same valence shell and the same number of electrons are in between the nucleus and the outermost shell. We can understand this better with the help of examples. In Lithium, the atomic number is 3 and its electronic configuration is 1s2,2s1. In this example, there are 2 electrons between the nucleus and the outermost shell. Within the same period, for example, Magnesium, has an atomic number of 4 and its electronic configuration is 1s2,2s2. In magnesium, there are again only 2 electrons that are between the nucleus and the outermost electron. The other electrons are all being added to the outermost shell and since there are all in one shell the number of electrons between the nucleus and the outermost shell does not increase. For this reason, as we move from left to right in a period in the periodic table, the shielding effect remains constant or the same.


Which scientific model could be used to predict the properties of an element?

The answer you are probably looking for is the periodic table, which arranges the elements. The periodic table can help predict properties of an element based on the element's location. All the elements in a veritcle collum (also known as family or group) will have the same number of valence electrons and thus behave in a similar manner. Elements can also be compared to one another on the horizontal axis(the period). i.e. moving from left to right elements become less metalic and do not exibit metallic properties as stongly. General location on the table can tell you what type of element it is; metal, nonmetal, metalloid/semimetal. or the # of protons and electrons in the element, the atomic mass.