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Elements

Elements. Elements, Compounds, and Mixtures Section 1 Elements Introduction of Matter. An element is a pure substance that cannot be separated into simpler substances by physical or chemical means. An Element has only One Type of Particle.

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Elements

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  1. Elements Elements, Compounds, and Mixtures Section 1 Elements Introduction of Matter

  2. An element is a pure substance that cannot be separated into simpler substances by physical or chemical means.

  3. An Element has only One Type of Particle • A pure substance is a substance in which there is only one type of particle.

  4. Every Element has an Unique Set of Properties • Each element has an unique set of properties that allows you to identify. Each element has its own characteristic properties. These properties do not depend on the amount of material present in a sample of the element.

  5. Characteristic Properties • Boiling Point • Melting Point • Density • Reactivity with acid

  6. Identifying Elements by their Properties

  7. Elements are Classified by their Properties • Elements are classified into groups according to their shared properties. • Metals- elements that are shiny and are good conductors of thermal energy and electric current. They are malleable and ductile. • Nonmetals- elements that are dull and that are poor conductors of thermal energy and electric current. Solid nonmetals tend to be brittle and nonmalleable. • Metalloids- semiconductors, elements that have properties of both metals and nonmetals.

  8. If you know the Category, You know the Properties • You can predict some of the properties of an unfamiliar element by knowing the category to which it belongs.

  9. Review Questions • What is a pure substance? • List three properties that can be used to classify elements. • Which category of element would be the least appropriate choice for making a container that can be dropped without shattering? Explain your reasoning.

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