Hello friends! As you know, the periodic table is an important concept in chemistry and science. So Today we shall talk about How Many Periods Are In The Periodic Table. A period in a periodic table is the horizontal row depicting elements with similar chemical properties.
There are 7 periods in a periodic table. As we go across each period from left to right, the elements show similar chemical and physical properties and the atomic number of the elements increases.
Periodic Table Groups and Periods
In chemistry, periods and groups are two ways to categorize the elements. Groups are the vertical columns in the periodic table, while periods are horizontal rows across the periodic table. The groups and periods follow certain rules with regard to the properties of elements. As you move down in a group, the atomic number increases. When you move from left to right across a group, the atomic number increases then too.
What Do Group And Period Mean in the Periodic Table
Groups are the vertical columns in the periodic table, while periods are the horizontal rows across the periodic table. The rule followed by the group is that all the elements belonging to the same group have the same valency. And all the elements across a period have the same number of atomic orbitals.
Difference Between a Group And a Period on the Periodic Table
Both in groups and periods, the atomic number increases as one moves downwards or towards the right. There are 18 groups in a periodic table, while the number of periods is 8.
In a period, as one goes from left to right, the element loses its metallic properties and becomes less metallic than its predecessor. While groups are used by chemists to determine a family of elements since they have similar chemical properties and the same number of electrons in their outer shell. For example, the first group (Group 1 ) belongs to alkali metals.