Chem121-Chapter-2-SH

Chem121-Chapter-2-SH - Chapter 2 Atoms Molecules and Ions R...

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1 Chapter 2: Atoms, Molecules and Ions Fe on Cu © R. Spinney 2009 The Atomic Theory of Matter 1. An element is composed of extremely small particles called atoms. 2. All atoms of a given element are identical and have identical properties that differ from those of other elements. 3. Atoms cannot be created, destroyed, or transformed into atoms of another element by chemical reactions. 4. Compounds are formed when atoms of more than one element combine; a given compound always has the same relative number and kind of atoms. Atomic Theory of Matter (cont’d) The theory that atoms are the fundamental building blocks of matter reemerged in the early 19th century, championed by John Dalton.
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2 Dalton’s Postulates All atoms of a given element are identical to one another in mass and other properties, but the atoms of one element are different from the atoms of all other elements. Dalton’s Postulates (cont’d) Atoms of an element are not changed into atoms of a different element by chemical reactions; atoms are neither created nor destroyed in chemical reactions. Dalton’s Postulates (cont’d) Compounds are formed when atoms of more than one element combine; a given compound always has the same relative number and kind of atoms.
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