Lanthanides
Assuming you mean Actinide series from atomic number 89 through to 103 is the bottom, but two were taken out of the main body of the table, the one above Actinide series is called the Lanthanide series from atomic number 57 through to 71.
That is:
Lanthanide series Atomic numbers 57-71
Actinide series Atomic numbers 89-103
The first period is at the top of the table. It consists of hydrogen and helium. The bottom period is period 7.
it will say period 3 at the bottom ;0
The horizontal rows of the periodic table are called Periods and the vertical rows are called groups.
the horizontal lines are called periods and the vertical lines are called groups.
The horizontal rows on the Periodic Table are called periods, while the vertical columns are called groups or families. For instance, iodine is in the same group, but different period to fluorine, chlorine and bromine.
lanthanides
The first period is at the top of the table. It consists of hydrogen and helium. The bottom period is period 7.
Actinides
The first three periods of the periodic table are called the first period, second period, and third period.
The properties which change regulary from top to bottom in a group and from leaft to right a period are called periodic property.
The first period of human life is called pre-history
Confuse question; probable you think to lanthanides.
Hydrogen
The bottom two rows shown on most periodic tables are:Lanthanide series - which belongs to the 6th periodActinide series - which belongs to the 7th period
On the left side (the first 12 columns + the bottom four in the 13th column+the bottom two in the 14th column+the bottom one in the 15th column)
Orphan
Triassic