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Date: 10-8-13 Day Plan: 1 ) Finish Isotope and Atom Packet 2) Start History of an Atom

Date: 10-8-13 Day Plan: 1 ) Finish Isotope and Atom Packet 2) Start History of an Atom Opener : Look at the picture below. Exampling A) How are all of these atoms alike B) How are all of these atoms different C) Explain what an Isotope is . Atoms & Their Isotopes – Paragraph #1 .

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Date: 10-8-13 Day Plan: 1 ) Finish Isotope and Atom Packet 2) Start History of an Atom

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  1. Date: 10-8-13 • Day Plan: • 1) Finish Isotope and Atom Packet • 2) Start History of an Atom • Opener : Look at the picture below. Exampling • A) How are all of these atoms alike • B) How are all of these atoms different • C) Explain what an Isotope is

  2. Atoms & Their Isotopes – Paragraph #1 • Entire world is composed of atoms • Atoms are composed of • Proton (charge +1) weigh 2000x more • Neutron (no charge) than electrons • Electron (charge -1) • Properties of an atom are determined by the number of P+, N0, and E-

  3. Key Questions • 1. The atomic number [Z] tells the reader the number of protons • 2. The mass number [A] tells the reader the number of protons and neutrons.

  4. 3. The number of protons is equal to the number of electrons. • 4. The electrical charge of an atom with an equal number of protons and electrons is neutral or no charge. • 5. The protons and neutrons are located in the nucleus of an atom. • 6. The two sodium isotopes have the same number of protons and electrons. • 7. The two sodium isotopes have different number of neutrons.

  5. Isotopes of an element • Atom has the same number of protons but a different number of neutrons • Neutral atoms have equal number of protons and electrons Atomic Symbol Notation A Mass Number (number of protons and neutrons) X Atomic Symbol Z Atomic Number (number of protons)

  6. 8. The following can distinguish an atom of one element from an atom of another element: • Mass  the number of protons and electrons • Atomic number  the number of neutrons

  7. Exercises • 1. Similarities include: • They are the same element • They each have 17 protons • They each have 17 electrons • 2. Differences include: • They have different mass numbers. • Cl-35 has 18 neutrons • Cl-37 has 20 neutrons.

  8. O S Kr

  9. O N S H H Mg Mg U Kr

  10. 1 fm = 1 x 10-15 m 1 pm = 1 x 10-12 m Problems • 1. The radius of a Cl nucleus is 4.0 fm, and the radius of a Cl atom is 100 pm. How many times larger is the diameter of the Cl atom than the diameter of a Cl nucleus? • 2. Two objects that have the same ratio of length.

  11. Volume = 4/3(pi)*r3 Problems • 3. How many times larger is the volume of the atom than the volume of the nucleus?

  12. 4. Use a periodic table to fill in the missing information in the following table.

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