metalliods and non-metals
The three main categories of elements on the periodic table are metals, metalloids, and nonmetals.
It organizes the elements.
Three main classes are:MetalsNon metalsTransition elementsThey are present in periodic table.
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18
In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses and repeating periodic properties.
There are 18 main groups in the modern periodic table of elements.
metalsnon metalssemi metals
Metals nonmetals and metalliods
The elements that are placed outside of the periodic table are called transactinides. These elements are usually placed in a separate row below the main table and are synthetic elements that do not occur naturally on Earth.
The main distinction is into metals and non-metals.