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At first, a scientist named Dmitri Mendeleev organized the Periodic Table according to an element's Atomic Mass, in increasing order. However, the periodic table is now organized by atomic number, in increasing order. Additionally, each column, also called a group or family, has elements with the same number of electrons in its outermost electron shell (valence shell). Because of this, elements of the same column will react similarly in a chemical reaction. As well, there are several categories of elements on the periodic table. Group 1A are the alkali metals and have 1 valence electron. Group 2A are the alkaline earth metals and have 2 valence electrons. Group 8A are the noble gases and have 8 valence electrons, meaning they do not react with any elements. Group 7A are the Halogens and have 7 valence electrons. Elements found to the left of the metalloid line are metals and the middle part of the table contains transition metals, which can vary in their number of valence electrons. To the left of the metalloid line are nonmetals. Elements found along the metalloid line are metalloids and have both properties of metals and nonmetals. Finally, the two rows extracted from the table are the Lancthinides and Actinides, which are generally radioactive in nature.
Wiki User
∙ 14y ago
Wiki User
∙ 13y agothe scientists decide where the elements go on the periodic table by how reactive the substance is. the elements of an atomic number greater than 92, are all radioactive. so all the radioactive elements are put on the periodic table after the atomic number "92"
Wiki User
∙ 11y agoby knowing the atomic number and its mass number
Wiki User
∙ 11y agothe elements are arranged in the modern periodic table according to the increasing atomic number and in addition, elements in the same group have the same number of valence electrons
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How did other scientists find missing elements from the periodic table table?
truño hardisson
How do chemists organize information about elements?
By grouping the elements on the Periodic Table.
Table of periodic elements?
See the link below fot the IUPAC model of the periodic table of elements.
What is the difference between the new and old periodic table?
Well, Back when Medeleev made this table, many of the elements were not even discovered yet. He plotted only the elements that he knew on his table. He organized them by increasing atomic weight. He didn't know all the elements so he would put question marks and empty spaces in the spots he thought elements would be and left to be found by other scientist. He happened to be true about the missing elements and that scientist did end up finding these "missing links" of the periodic table and led to the new or modern periodic table. The modern periodic table doesnt have any missing elements and they changed Medeleev's way of organizing the table by increasing atomic weight to increasing atomic number. So the newer form of the periodic table was complete and made it easier to find what elements react better with other elements. This making the modern table became the more efficent table of our time.
Elements on very first Periodic Table?
Yes, there were elements on the first periodic table. I believe that there are still elements on the periodic table.
How did other scientists find missing elements from the periodic table table?
truño hardisson
How did the arrangement of the periodic table help scientists know when they had found the missing element?
Apexvs. Patterns in the elements' properties
What were the 3 missing elements in the periodic table?
my vasss
What is one way scientists have grouped elements?
the Periodic Table of elements
What is a large table that scientists use to find out information about metals and other elements?
The periodic table of elements
Why scientists believe no elements are missing in the periodic table?
The periodic table contains all the known elements. Scientists have spent decades looking for new elements and, so far, haven't found any beyond what are on the periodic table as it stands now.
what does the arrangement of the periodic table scientists see?
Patterns in the elements' properties
What do elements in the periodic table do?
The periodic table is just a way of grouping elements according to their atomic numbers. It helps scientists to understand why different elements react in different ways.
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
Who wrote or found the periodic table of elements?
The periodic table of elements was created by Dmitri Mendeleev, a Russian chemist, in 1869. He arranged the elements based on their atomic mass and properties, and left gaps for elements that were yet to be discovered. Over time, new elements were discovered and added to the periodic table by various scientists.
What are the origins of the elements in the periodic table?
Dmitri Mendeleev compiled all known elements in a table. Not satisfied, he researched more elements from various scientists and included it in his table.
