(a) State what are elements.
(b) What are the three main types of elements ?
(c) Write one property of each type of elements.
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Answers
a. In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by chemical means.
b. Elements in different groups are lumped together in one of three classes, depending on their properties. The classes are metals, nonmetals, and metalloids
c. Metals are generally shiny, malleable, and hard. Metals are also good conductors of electricity. Examples of metals are Gold, Silver, Iron, Uranium, and Zinc.
Non-metals do not conduct heat or electricity very well. Non-metals are typically brittle and are not easily molded into shapes. Example non-metal elements are Hydrogen and Carbon.
Metalloids share characteristics of both metals and non-metals and are also called semimetals. Metalloids are typically semi-conductors, which means that they both insulate and conduct electricity. This semi-conducting property makes Metalloids very useful as a computer chip material. Examples of metalloid elements are Silicon and Boron.
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(a) a substance that cannot be broken into two or more different substances by physical or chemical means , or electrolysis is called elements
(b) three main types of elements are metals , non-metals, metalloids.
(c) metals are ductile.
non-metals are non ductile