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What is shelding effect and what are it's variation in periodic table?
Wiki User
∙ 12y ago
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.
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoThe decrease in the attractive force exerted by the nucleus on the valence shall due to presence of the electron laying between the nucleus and valence shall is called shielding effect
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What is the name of the table of elements?
A Periodic table The Periodic Table of the Elements.
Which element of the periodic table has the greatest effect on human history?
This is probable iron.
Which element is the heaviest in periodic table?
who introduced the first Periodic Table
Which can be found on a periodic table elements compounds or mixtures?
Elements are found on periodic table. Compounds are not present on periodic table. The table does not contains mixture.Elements can be found on a periodic table. Compounds can be made by bonding two or more elements. But they are not depicted on the periodic table.
What is S4F3 on periodic table?
s on periodic table
Julius Lothar Meyer its contribution to the development of the periodic table?
Julius Lothar Meyer devised a classification of elements into a table that accounted for the periodic variation in properties. his table included 56 elements.
What is the name of the table of elements?
A Periodic table The Periodic Table of the Elements.
How are the elements arranged?
atomic number
What are the harmful effect of the element in the periodic table?
Killer,Joker, Bugger and Sniper
Which element of the periodic table has the greatest effect on human history?
This is probable iron.
What is the most obvious common characteristic of elements in the same column in a periodic table?
valance, although there is lot of variation here as well.
What is a group in a periodic table.?
A group in Periodic Table is the column of element in periodic table
What is a chart that lists all the known elements?
It is called the Periodic Table of Elements.
Is snow on the periodic table?
No, it is not on the periodic table.
In the periodic table what is a period?
A period on the periodic table is a row.This is the horizontal section of the periodic table.
What are chemical compounds on the periodic table?
There are no compounds on the periodic table. The periodic table only lists elements.
Which element is the heaviest in periodic table?
who introduced the first Periodic Table
