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The order of the periodic table is made according to the atomic weights of the elements. The number of protons and neutrons in the nucleus make the atomic weight. Protons make the elements in order of the periodic table.
including "unknown elements" there are 59 elements in half of the periodic table, not including them there is 55.5 Added: 92 natural elements/2 = 46 natural elements make up 1/2 periodic table.
NaI is the compound named sodium iodide made of the elements sodium (Na) and iodine (I). You will find the elements themselves on the periodic table, not the compounds they make.
182 I don't think there are compounds in the periodic table. As far as I know the periodic table contains only elements, compounds are formed by ionic/covalent bonding which is another story already. http://www.webelements.com/
These are carbon, hydrogen, oxygen.
To make study of elements easier.To classify elements.
118 elements.
"metals"
No they did not.
The order of the periodic table is made according to the atomic weights of the elements. The number of protons and neutrons in the nucleus make the atomic weight. Protons make the elements in order of the periodic table.
including "unknown elements" there are 59 elements in half of the periodic table, not including them there is 55.5 Added: 92 natural elements/2 = 46 natural elements make up 1/2 periodic table.
There are 32 elements in the 6th period of the periodic table.
NaI is the compound named sodium iodide made of the elements sodium (Na) and iodine (I). You will find the elements themselves on the periodic table, not the compounds they make.
It is called the key of life because all the elements or compounds of the elements of on the periodic table make up the world.
In order to organize the elements
He is the founder of the periodic table. He arranged the elements according to the atomic masses. Few changes are made in his periodic table to make the modern periodic table.
There are 18 groups that make up The Periodic Table of Elements.