The first period is at the top of the table. It consists of hydrogen and helium. The bottom period is period 7.
The first period is not at the bottom of periodic table.
Actinides (or Actinoids)
The Lanthium Series
radio active elements
Actinides
The allowed orbital types for the second period of the periodic table are 2s and 2p.
Lithium is in the second period and the first group in the Periodic Table of Mendeleev.
You can discover this by looking at a periodic table of the elements.The rows of the table are called periods; the columns are called groups.The second period therefore begins with the element Lithium and ends with the element Neon.
fluorine
There are 114 elements in the periodic table, not just 2.
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
The first three periods of the periodic table are called the first period, second period, and third period.
No. There are two rows at the bottom of the periodic table. the first row elements are called lanthanides and the second row elements are called actinides.
The allowed orbital types for the second period of the periodic table are 2s and 2p.
There are no specific names for rows in the periodic table because properties of elements in the rows do not match with one other. If we talk about the groups, then there is always some kind of similarity in the groups. For instance, let us take group-I, they are known as the "Alkali metals" because all of them form alkali solutions when their oxides are dissolved in water.
Second period elements have two electronic shell.It comprises of eight elements.They are lithium,beryllium,boron,carbon,nitrogen,oxygen,fluorine and neon.
The second period. (Rows)
Lithium is in the second period and the first group in the Periodic Table of Mendeleev.
You can discover this by looking at a periodic table of the elements.The rows of the table are called periods; the columns are called groups.The second period therefore begins with the element Lithium and ends with the element Neon.
A wave or other periodic phenomenon with a period of 1 second has a frequency of 1 Hz.
fluorine
There are 114 elements in the periodic table, not just 2.