Group 1 Elements in the Periodic Table

The video tutorial explores Group 1 elements in the periodic table, focusing on their electronic structure, properties, and reactivity. It explains that these elements have one electron in their outer shell and are soft metals that become softer down the group. Their reactivity increases with air and water as you move down the group due to the ease of losing the outer electron. The concept of shielding, where inner electrons interfere with the nucleus's hold on the outer electron, is also discussed, highlighting why cesium is highly reactive.

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

• Boron

• Lithium

• Carbon

• Helium

What is a common characteristic of the electronic structure of Group 1 elements?

• They have one electron in their outer shell.

• They have no electrons in their outer shell.

• They have a full outer shell.

• They have two electrons in their outer shell.

How do the physical properties of Group 1 metals change as you move down the group?

• They become softer.

• They become harder.

• They become more dense.

• They become more brittle.

Why are Group 1 metals stored in paraffin or gases?

• To prevent them from reacting with air.

• To make them more conductive.

• To enhance their color.

• To prevent them from melting.

What happens to Group 1 metals when they are exposed to air?

• They emit light.

• They become magnetic.

• They tarnish quickly.

• They become shiny.

What is the nature of the reaction between Group 1 metals and water?

• It is a violent reaction.

• It is a slow reaction.

• It is a non-reactive process.

• It is a cooling reaction.

Why is cesium considered the most reactive metal in Group 1?

• It has the most electrons.

• Its outer electron is far from the nucleus.

• It has the smallest atomic size.

• It is the lightest metal.

What is the effect of shielding on the reactivity of Group 1 metals?

• It increases the attraction of the nucleus.

• It makes the nucleus more stable.

• It decreases the attraction of the nucleus.

• It has no effect.

How does the concept of shielding relate to the analogy of a magnet wrapped in paper?

• The paper decreases the magnet's strength.

• The paper increases the magnet's strength.

• The paper makes the magnet more attractive.

• The paper has no effect on the magnet.

What happens to the reactivity of Group 1 metals as the atomic size increases?

• Reactivity increases.

• Reactivity remains the same.

• Reactivity becomes unpredictable.

• Reactivity decreases.