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Intro to Atoms. I. Structure of an Atom Nucleus – very small center of atom –Protons – positive charge –Neutrons – no charge Electrons – negative charge.

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Presentation on theme: "Intro to Atoms. I. Structure of an Atom Nucleus – very small center of atom –Protons – positive charge –Neutrons – no charge Electrons – negative charge."— Presentation transcript:

1 Intro to Atoms

2 I. Structure of an Atom Nucleus – very small center of atom –Protons – positive charge –Neutrons – no charge Electrons – negative charge –Move rapidly around nucleus –Very small compared to p + and n 0

3 II. Models of the Atom ModelWhenDescriptionPicture 1. Dalton 2. Thomson 3. Rutherford 4. Bohr 5. Present Modern Skip 3 lines for each row

4 1. Dalton’s Model When – 1808 Description –Tiny, solid balls –Every element’s atoms are alike –Each element has atoms of diff mass

5 2. Thomson’s Model When – 1897 Description – –Positive & negative parts –Muffin with berries

6 3. Rutherford’s Model When – 1911 Description – –Atom mostly empty space –e - ’s orbit randomly around small + charged nucleus

7 4. Bohr’s Model When – 1913 Description – –e - ’s move in specific shells

8 5. Present Modern Model When – 1920s to present Description – –e - ’s form negatively charged cloud around nucleus –Can’t tell where an e - is

9 III. Atoms & Elements 6 C Carbon Atomic Number Element’s Symbol Element’s Name Atomic Mass

10 Atomic # = # of p + Atomic Mass # = # p + + # n 0 # p + = atomic # # e - = atomic # # n 0 = Round off (mass # - atomic #)

11 Isotopes – atoms with same # p + but different # of n 0 - Introduction to Atoms


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