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Cycle 4 Overview (digestive system (salivary glands chemical, gull…
Cycle 4 Overview
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Elements:
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they are called building blocks of matter because all matter is composed of one element or a combination of two more elements
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periodic table
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It tells the symbol, the atomic number and the atomic mass
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valence electrons
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the number of valence electrons determines the many properties of the element including the way it bonds with other atoms
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Matter
They once believed that matter was made up of 4 elements air, earth, fire and water
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scientific theory
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theries often include models physical, mental, visual
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reaction
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physical reaction does not change the what the substance is, in reaction the energy is given off or absorbed
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