CHAPTER 2 (2.1) (Neeta) - CHAPTER 2 ATOM MOLECULE ION AND...

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CHAPTER 2 ATOM, MOLECULE, ION AND PERIODIC TABLE 2.1 Atomic theory & structure. 2.2 Atomic number, mass number & isotopes. 2.3 Molecule & Ion compounds. 2.4 Nomenclature and chemical formula.
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CHAPTER 2.1: ATOMIC THEORY & STRUCTUTE
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INTRODUCTION ????? What is meant by matter?
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INTRODUCTION The substance that objects are made of. Made up of atoms or molecules. It has mass and volume. Occupies space. Exist in 3 states aggregation.
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INTRODUCTION What is meant by atom? ?????
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INTRODUCTION Atoms are elements, they are simply the smallest particle of an element that can be identified as that element. It is composed by neutrons, electrons and protons.
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DEFINING THE ATOM The Greek philosopher Democritus (460 B.C. – 370 B.C.) was among the first to suggest the existence of atoms (from the Greek word “atomos”) He believed that atoms were indivisible and indestructible His ideas did agree with later scientific theory, but did not explain chemical behavior , and was not based on the scientific method – but just philosophy
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