the elements are categorised into firstly metals and non metals. metals are on the right and middle and non metals are on the left. Then they are categorised according to reactivity, for example the first column on the far left are all alkali metals, bar helium, which are highly reactive to water and air. Then the next column is of alkali earth metals, which are like alkali metals but are found more naturally are are less reactive.
here's a link to a site that might help because i'm not brilliant at explaining
Mendeleev arranged the elements in a table in the increasing order of atomic masses and repeating periodic properties. In the modern long-form of periodic table, the elements are arranged in the increasing order of atomic number and repeating periodic properties.
chemistry
i know a song about it it is "do u know the first ten elements of the periodic table there's hydrogen, helium, lithium, borileam, boron, carbon, nitrogen, oxygen, florine, and neon"
Many more elements are known today then when Mendeleev laid out his table. In addition, he arranged his table by atomic mass and there are places in the periodic table where mass does not always increase. An example is between tellurium and iodine.
Arsenic did not create the first periodic table. The first periodic table was created by Dmitri Mendeleev, a Russian chemist, in the 1860s. Other scientists had organized elements in other ways prior to the invention of Mendeleev's periodic table, but the other methods were criticized and did not catch on.
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.
Mendeleev arranged the elements in a table in the increasing order of atomic masses and repeating periodic properties. In the modern long-form of periodic table, the elements are arranged in the increasing order of atomic number and repeating periodic properties.
Periodic table can be classified as:MetalsTransition elementsNon-metalsThey occupy different groups.
chemistry
Sounds like the Periodic Table of the elements.
He formulated the Periodic Law and revised and predicted the Periodic Table of Elements in some important ways.
i know a song about it it is "do u know the first ten elements of the periodic table there's hydrogen, helium, lithium, borileam, boron, carbon, nitrogen, oxygen, florine, and neon"
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.
Many more elements are known today then when Mendeleev laid out his table. In addition, he arranged his table by atomic mass and there are places in the periodic table where mass does not always increase. An example is between tellurium and iodine.
Arsenic did not create the first periodic table. The first periodic table was created by Dmitri Mendeleev, a Russian chemist, in the 1860s. Other scientists had organized elements in other ways prior to the invention of Mendeleev's periodic table, but the other methods were criticized and did not catch on.
because the elements can combine in many different ways and thus there are nearly unlimited possible compounds.
the periodic table is organized in a few ways. The elements in a column (up to down) are placed like that because they have the same amount of valence electrons (electrons in outer shell). The periodic table is also divided with metals on the right and covering most of the middle, metaloids to the right and gases to the far right of the table. Lastly because of Aluminum's physical and chemical properties it is with the other metals in about the center of the periodic table.