Answer:
Elements in group 17 are known as “salt formers”. They are called halogens. ... The elements at the bottom of the table were pulled out to keep the table from becoming too long. The first period at the bottom is called the lanthanides. The second period at the bottom of the table is called the actinides.
Explanation:
The table itself is comprised of 7 periods and 18 groups, with the latest known ... here, 57, is located at the bottom of the table in the row called the Lanthanides.
The second period at the bottom of the periodic table which are below the lathanide series is called the Actinoid series.
The Actinoid series consists of 15 elements which are metals, also reffered to as the inner transition metals. The atomic number of these elements ranges from 89 to 103.
The first element in the Actinoid series element is the Actinium element, Ac ; while the last element is Lawrencium, Lr with an atomic number of 103.
Therefore, the second period at the bottom of the periodic table is the Actinoid series.
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