What are Groups in the Periodic Table?

The video tutorial explains Group 1 elements in the periodic table, highlighting their electronic structure, periods, and properties. It discusses the reactivity of these soft metals, which increases down the group due to the ease of losing their outer electron. The concept of shielding is introduced, explaining how inner electrons interfere with the nucleus's ability to hold onto the outer electron, making elements like caesium highly reactive.

How do the electronic structures of Group 1 elements relate to their position in the periodic table?

What is the significance of shielding in relation to the reactivity of Group 1 metals?