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.

Which of the following is a characteristic of Group 1 elements in the periodic table?

• They have one electron in their outer shell.

• They have two electrons in their outer shell.

• They are non-metals.

• They are gases at room temperature.

What happens to the softness of Group 1 metals as you move down the group?

• They remain the same.

• They turn into liquids.

• They become harder.

• They become softer.

Why are Group 1 metals stored in paraffin or inert gases?

• To make them more reactive.

• To prevent them from reacting with air.

• To enhance their color.

• To prevent them from melting.

What is the main reason for the increasing reactivity of Group 1 metals down the group?

• The metals become denser.

• The metals have fewer electron shells.

• The outer electron is further from the nucleus.

• The outer electron is closer to the nucleus.

What is the concept called that describes how inner electrons interfere with the nucleus's ability to hold onto the outer electron?

• Conductivity

• Ionization

• Magnetism

• Shielding