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Answered 2009-02-07 03:36:56

The first periodic table was put in order of atomic mass, not atomic number.

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He did not have as many resources available. Most of it was experimenting and guesswork to figure out what each element was.


Dimitri Mendeleev influenced the field of chemistry and how students learn the periodic table. His major contribution was organizing?æelements in an orderly fashion on a table. Th periodic?ætable helps?æchemistry students figure out many things about the different elements.


The first periodic table was developed by Dmitri Mendeleev in the mid-19th century.He wasn't the only person thinking along those lines ... both John Newlands and Lothar Meyer had proposed similar ideas However, Newlands was largely criticized and ignored at the time, and Meyer didn't make any predictions, so Mendeleev's table (which did make predictions about the properties of several as-yet-undiscovered elements) is generally regarded as the first.


Mendeleev believed and enunciated the law of periodicity of chemical properties for chemical elements.


Dmitri Mendeleev created the first periodic table according to atomic mass in 1869. Others before Mendeleev had organized the elements according to their properties and were able to discern periodicity, although Mendeleev is generally accepted as the creator of the table.With the information he gathered about the elements, he was able to see that there were missing elements that hadn't been discovered. He could figure out the atomic masses of the missing elements by averaging the atomic masses of the elements above and below the missing one. One such element, which he called "eka-silicon" (eventually Ge) was missing, but with understanding of the patterns the periodic table made, he predicted the elements appearance, melting point, atomic mass, density, formula of oxide, and formula of chloride.Throughout the years, other scientists were able to find or create these missing elements to form the table we know today. Today's periodic table is ordered by atomic number instead of atomic mass (as Mendeleev had started). Henry Moseley was the first to order the elements by atomic number so elements would fit together in groups/families and periods better in 1913.



You can "figure out" by checking the periodic table :D



1. Because the elements are categorized in logical, periodic intervals.


You can figure out an alien periodic table by organizing the elements you have by their mass. Then start checking for other properties like conductivity and solubility. This is how our periodic table was organized.


we make a stick figure with toothpicks or matchsticks and lick them together


To figure this out, all you need to do is look at a periodic table. On the periodic table, locate the element whose atomic number is 14 and you have your answer. It turns out that that element is silicon.


Spatial figure is a three dimensional figure. It is made up of plane figure whose all sides are joined together to form a close figure






It looks like lines stuck together to make a closed figure


You have to break the figure into smaller parts.Then add all the sides together.


Add together the length of its sides. The accumulated lengths of its sides is the perimeter.


Yes, we will forever be adding new elements to the periodic table as we figure out new ways to make them; however, most of what you see now will stay the same.


You can figure it out by comparing the two elements and there average atomic mass to the one on the periodic table, and which ever is closest to the isotope on the periodic table is the most abundant.


You can figure out the ionization energies of different elements relative to each other based on where they appear on the periodic table. It increases down a group and from right to left.


you add them all together and then you divide it by how many weights were added together and you get your answer




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