atomic number 101 - Md - Mandelevium
The number of protons in an atom of the element.
Any Element found by mankind is on the Periodic Table.
All of them do.
Atomic weight
This is the Russian chemist Dimitri Mendeleev.
Argon.
The element is an inner transition metal called lanthanum, with the atomic number 57.
There are 7 periods in the modern periodic table.
Eka-aluminum corresponds to the element gallium on the modern periodic table. Eka-aluminum was a placeholder name given by Dmitri Mendeleev for an element that he predicted would have properties similar to aluminum but with a higher atomic mass. Gallium, discovered in 1875, fits these properties and is known as eka-aluminum's modern counterpart.
Argon is in the third period of the modern periodic table.
Ir refers to iridium element that is placed in group-9 and period-6 in the modern periodic table.
because its the element that created the earth