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Download Properties of metals, non-metals and semi-metals - E
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Name: These characteristics of materials assist to classify materials into metals or nonmetals: Appearance Heat conductivity State of Matter Ductile (can stretch) Magnetism Melting point Malleable (can bend) Electrical conductivity This is a summary of the properties of metals and non-metals: PROPERTY METALS NON-METALS Appearance Shiny Dull State of matter Solids (except Mercury which is liquid at room temperature) Can be either gases, liquids or solids Electrical conductivity Good conductors Poor conductors Heat conductivity Good conductors Poor conductors Magnetic Iron, Cobalt and Nickel are Not magnetic magnetic Malleable Can bend without breaking Brittle, break when bent Ductile Can be stretched out Cannot be stretched Melting point High (need a lot of heat to Low (many are gases be melted) and liquids at room temperature) © e-classroom 2014 www.e-classroom.co.za GRADE 7 Grade 7 Term 2 Natural Science: Matter & Materials: Introduction to the Periodic Table of Elements (Properties of Metals, Non-metals and Semi-metals) Properties of metals, non-metals and semi-metals GRADE 7 Write their symbols next to their names below: Boron Arsenic Silicon Antimony Germanium Tellurium Semi-metals have some metallic properties and some non-metallic properties. For example, they look like metals and are shiny, but they aren’t ductile or malleable. They are semi-conductors as they can conduct electricity but not very well. Semi-conductors are very popular in the electronics industry. Silicon and Germanium, for example, are used in devices like computers, phones and radios. Answer the following: 17 36 17 36 Cl What is this element’s name? Is it a metal, non-metal or semi-metal? Name one characteristic of this type of element. Mg What is this element’s name? What type of element is it? Provide one word to define these words: “Malleable”“Ductile” © e-classroom 2014 www.e-classroom.co.za Grade 7 Term 2 Natural Science: Matter & Materials: Introduction to the Periodic Table of Elements (Properties of Metals, Non-metals and Semi-metals) Semi-metals are between the Metals and Non-metals on the Periodic Table. Semi-metals are between the Metals and Non-metals on the Periodic Table. Write their symbols next to their names below: BoronB Arsenic As Silicon Si Antimony Sb Germanium Tellurium Ge T Answer the following: Cl 17 36 What is this element’s name? Chlorine Is it a metal, non-metal or semi-metal? Non-metal Name one characteristic of this type of element. Dull, Brittle, Not ductile, Not malleable, Doesn’t conduct heat or electricity. 17 36 Mg What is this element’s name? Magnesium What type of element is it? Metal Give one word to define these words: “Malleable”“Ductile” Bends Stretches © e-classroom 2014 www.e-classroom.co.za Grade 7 Term 2 Natural Science: Matter & Materials: Introduction to the Periodic Table of Elements (Properties of Metals, Non-metals and Semi-metals) GRADE 7 Answer sheet
