he came up with the theory of atomic numbers
on the right side of the peridic table
Dmitri Mendeleev
Mosley arranged elements in order of increasing atomic number
Element 4 Beryllium
verticle rows are grouped
There are currently 118 elements on the periodic table.
Atomic Mass
This chemical element is helium.
Gold (Au) is classified as a transition metal.
A horizontal rows on the peridic table
Metals cover about 2/3rds of the periodic table, and by using the link it will be easy to see where they are.
The Periodic Table consists of 118 elements, number 118 being ununoctium.