Group1 As An Example Of Groups In The Periodic Table

The video tutorial explains the properties and reactivity of Group One elements in the periodic table, including lithium, sodium, potassium, rubidium, cesium, and francium. These elements have one electron in their outer shell and are soft metals that become softer down the group. They are highly reactive, especially with air and water, and are stored in paraffin or inert gases. The reactivity increases down the group due to the ease of losing the outer electron, a concept explained by shielding, where inner electrons interfere with the nucleus's hold on the outer electron.

Which of the following elements is NOT part of Group One in the periodic table?

• Potassium

• Calcium

• Sodium

• Lithium

What is a common characteristic of the elements in Group One regarding their electronic structure?

• They have a full outer shell.

• They have no electrons in their outer shell.

• They have one electron in their outer shell.

• They have two electrons in their outer shell.

How do the physical properties of Group One elements change as you move down the group?

• They become more dense.

• They become harder.

• They become less reactive.

• They become softer.

Why are Group One elements stored in paraffin or inert gases?

• To prevent them from melting.

• To enhance their color.

• To prevent them from reacting with air.

• To make them more conductive.

What is the concept of shielding in the context of Group One elements?

• The outer electron is far from the nucleus and easily lost.

• The nucleus is shielded from external forces.

• The elements are protected from corrosion.

• The outer electron is tightly held by the nucleus.