Question

Describe the modern periodic table in terms of groups and periods.

Answer 1

Similar properties recur periodically when elements are arranged according to increasing atomic number."

Answer 2

Answer:

• A period is a periodic table's horizontal row.  
• The periodic table contains seven periods, each starting at the far left.  A fresh era starts when the filling of electrons starts with a fresh main energy level.  
• Period 1 consists of only ‘two elements’ (hydrogen and helium), “while periods 2 and 3” contain eight elements. The fourth and fifth periods have 18 elements.

• Periods 6 and 7 have 32 elements since those periods belong to the two lower rows separated from the remainder of the table.
• They are taken out to create the table fit onto a single page more readily.

• A group is a periodic table vertical column based on the outer shell electrons organisation. There are “18 groups in total”.