I'm going to assume you meant the Geologic Time Scale, not the Periodic Table of the Elements. In that case, the answer is the Hadean Era (which is the first in the Precambrian Eon) Although Archean Era might also be acceptable.
After lanthanum, thus the name.
Symbols represent name of the element. They signify the position of element in periodic table.
Ba. You'll find this in your copy of the periodic table of the elements.
Hydrogen
A group is a column in the periodic table of elements.
A Periodic table The Periodic Table of the Elements.
The element abbreviated with As on the periodic table is Arsenic
After lanthanum, thus the name.
A row on the periodic table is called a period.
Carbon's name is C on periodic table. It belongs to group no. 14.
The Periodic Table.
Periodic table!
There are 118 elements. They are on the Periodic Table.
Another name for a group on the Periodic Table is a column.
Hydrogen (H) is the first element in the periodic table.
The columns on a periodic table are also known as groups.
Everything on The Periodic Table is an element, hence the the name PERIODIC TABLE OF ELEMENTS - - - - - Well...the paper the table is printed on and the ink used to print it with are not elements, but everything else is.