What Are Periods & Groups In The Periodic Table?

The video tutorial explains the periodic table's structure, focusing on periods and groups. Periods are horizontal rows where elements share the same number of energy shells, while groups are vertical columns where elements have the same number of valence electrons. The tutorial highlights how these arrangements help predict element properties and reactivity. Group 7 elements, such as fluorine and chlorine, are used as examples to illustrate these concepts.

Can you explain the concept of valence electrons and their importance?

Describe the trend in properties as you move down a group in the periodic table.