Metalloids - Is Matter Around Us Pure | Class 9 Chemistry

Magnet Brains・2 minutes read

The session delves into the classification of elements into metals, non-metals, and metalloids based on their physical and chemical properties, focusing on the unique characteristics of each category. Metalloids like silicon and germanium exhibit properties that bridge the gap between metals and non-metals, serving as semiconductors and demonstrating a range of conductive and insulating properties.

Insights

  • Elements are divided into metals, non-metals, and metalloids based on their physical and chemical properties, with metalloids like Silicon and Germanium having characteristics that fall between metals and non-metals.
  • The distinction between metals and non-metals lies in their physical properties, with metals like Gold being highly ductile and excellent conductors of electricity, while non-metals such as graphite are poor conductors but find use in applications like electrodes and dry cells.

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Recent questions

  • What are metalloids?

    Elements with mixed properties between metals and non-metals.

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Summary

00:00

"Metalloids: Properties Between Metals and Non-Metals"

  • Elements can be categorized into metals, non-metals, and metalloids based on physical and chemical properties.
  • The session focuses on the physical properties of metals and non-metals.
  • There are a total of 108 elements, some with similar properties grouped into separate categories.
  • Elements with properties between metals and non-metals are called metalloids, like Silicon and Germanium.
  • Metalloids have mixed properties, acting as conductors and insulators depending on conditions.
  • A real-life example of metalloids is silicon in solar panels, initially an insulator but can conduct electricity when exposed to sunlight.
  • Metalloids are also known as semiconductors due to their mixed properties.
  • Metalloids neither fully conduct nor fully insulate electricity, like silicon in solar cells.
  • Metalloids like Antimony and Arsenic exhibit properties between metals and non-metals.
  • The session concludes with a comparison of physical properties between metals and non-metals, highlighting differences in states at room temperature.

20:18

Metals and Non-Metals: Properties and Uses

  • Graphite melts at a high temperature, unlike what would be expected for carbon.
  • Metals like Bajrangbali have high density, while non-metals like Rangoli have lower density.
  • Metals exhibit strength, ductility, and malleability, transforming into thin sheets when struck or stretched.
  • Gold is highly ductile, with just one gram capable of producing a two-kilometer long wire.
  • Metals are good conductors of electricity, while non-metals are poor conductors, with graphite being used for electrodes and dry cells.
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