7th period.
it does not neccicarely have a period, but if you needed one it would be the actinide series! Se it is not a number just the name of the series!
Elements across a series have the same number of atomic energy levels. An elemental series is better known as a period.
The elements in the horizontal rows are called periods.
Periods and series are used when grouping elements. Elements are listed in rows, as periods, on the periodic table so that each is grouped with others with similar properties.
Period is called the elements are arranged in a series of rows so that those with similar properties appear in a column.
Lanthanoids is a series of 14 elements starting after lenthanum 57 and it belongs to the 6 period and fblock of the periodic table.
The "Septimus Heap" series, also known as the "Magyk" series, is set in a fictional time period that combines elements of medieval and fantastical settings. The series features a unique world filled with magic, wizards, and mythical creatures, creating a whimsical and enchanting backdrop for the story.
"Hakkenden: Eight Dogs of the East" is a fictional anime series that takes place in a unique fantasy world with feudal elements and supernatural elements. It does not correspond to a specific time period in our history.
After the IUPAC nomenclature lanthanum is a lanthanoid and actinium is an actinoid.
Actinoids is series of chemical elements; lanthanoids is an other different series.
14 elements.
The actinide elements are in a row at the bottom of most tables, this entire row being an extension of column 3 of the seventh period.