Lanthanoids and its Position in Periodic Table - D and F Block Elements - Chemistry Class 12

TL;DR

Lanthanides are a series of elements that come after lanthanum in the periodic table, and they are placed in the sixth period and the third group due to their similar atomic size and chemical properties.

Transcript

click the bell icon to get latest videos from akira hello friends in the previous topic we have discussed about the f-block elements as well as we also discussed upon the you know transition series and now in this topic we are going to talk about length notes and its position in the periodic table so what are length runs this is what we are going t... Read More

Key Insights

• ❤️‍🩹 Lanthanides are a series of elements that follow lanthanum in the periodic table, starting with cerium and ending with lutetium.
• ❓ These elements are referred to as lanthanides or lanthanoids.
• 🫀 Lanthanides are placed in the sixth period and the third group of the periodic table due to their similar atomic size and chemical properties.
• 🧘 The valency of lanthanides varies depending on their position in the periodic table.
• 🏑 Lanthanides possess unique properties and find applications in various fields such as electronics, magnets, and catalysts.
• ❓ Their compounds often exhibit colorful luminescence.
• 🥇 Placing lanthanides in a separate series prevents disruption of the periodic table's structure if they were placed side by side.

Questions & Answers

Q: What are lanthanides and why are they significant?

Lanthanides are a series of elements that come after lanthanum in the periodic table. They are significant because they possess unique properties and are widely used in various applications such as electronics, magnets, and catalysts.

Q: How are lanthanides different from other elements in the periodic table?

Lanthanides have similar atomic sizes and exhibit similar chemical properties. They also have high melting and boiling points, and their compounds often display colorful luminescence.

Q: Why are lanthanides placed in the sixth period and the third group of the periodic table?

Lanthanides are placed in this position because their atomic sizes do not differ significantly, unlike the trend observed across a period. This positioning ensures that lanthanides with similar properties are grouped together.

Q: What is the valency of lanthanum and hafnium?

Lanthanum belongs to the third group, so its valency is three. Hafnium, on the other hand, belongs to the fourth group and has a valency of four.

Summary & Key Takeaways

• Lanthanides are a series of elements that follow lanthanum in the periodic table, starting with cerium and ending with lutetium.

• The elements in the lanthanides series are referred to as lanthanides or lanthanoids.

• Lanthanides are placed in the sixth period and the third group of the periodic table due to their similar atomic size and chemical properties.