Yes, all the elements (natural or artificial) are contained in the periodic (Mendeleev) table of the elements.
I have no idea how to answer that. All the things listed in the periodic table are elements, and there are a lot more than 32 of them.
by their atomic number
Carbon , Hydrogen and Oxygen.
If your talking about the atomic mass number it is because the amount of neutrons can very. If you are talking about the actual amount of total elements on the periodic table it is because we keep discovering new things.
Elements
Yes, all the elements (natural or artificial) are contained in the periodic (Mendeleev) table of the elements.
I have no idea how to answer that. All the things listed in the periodic table are elements, and there are a lot more than 32 of them.
Lanthanide elements
It is about half
The first twenty elements are made up f different things
by their atomic number
Because it shows all the natural occoring things on earth
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Carbon , Hydrogen and Oxygen.
The periodic table was not 'identified.' It is simply all known elements ordered by similar qualities and atomic number, among other things.
If your talking about the atomic mass number it is because the amount of neutrons can very. If you are talking about the actual amount of total elements on the periodic table it is because we keep discovering new things.