Lecture17 (Ch17_Atoms)-1

Lecture17 (Ch17_Atoms)-1 - 1 Lecture 17 Lecture 17 Lecture...

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Unformatted text preview: 1 Lecture 17 Lecture 17 Lecture 17 Lecture 17 Lecture 17 Lecture 17 Lecture 17 Lecture 17 Chapter 17 Chapter 17 Atoms and Periodic Table Atoms and Periodic Table Plan 1. Atoms - Basic Facts 2. Atomic Nuclei 3. Chemical elements 4. Periodic Table 5. Summary Chapter 17: Home Work Key terms Review questions: 1, 2, 3, 10, 17, 19 Exercises: 11, 12, 15, 16, 19 1. Atoms: Basic Facts Atoms are basic building blocks of matter The word atom is derived from the Greek word atom which means indivisible. Atoms are composed of three type of particles: protons, neutrons, and electron. 2 Can we see atoms? Typical size of molecules and atoms is about 0.1 nm or 1 (Angstrom). 1 = 10-10 meter Why we cannot see atoms and molecules? Answer: Because of diffraction! A typical human eye will respond to wavelengths in air from about 380 to 750 nm How atoms look like? Atom of Helium Nucleus consists of 2 protons (p) and 2 neutrons (n) Atomic shell consists of 4 electrons (e- ). Note: 1 = . 10 10 m !...
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Lecture17 (Ch17_Atoms)-1 - 1 Lecture 17 Lecture 17 Lecture...

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