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Chapter 4

Chapter 4. Elements and the Periodic Table. Atoms and Elements (4.1). Just like the grouping of spices or candy, the elements have their own spot on the chart. Elements. Look at the painting, how do you think the artist made the painting?. Theories of Elements. John Dalton-English chemist.

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Chapter 4

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  1. Chapter 4 Elements and the Periodic Table

  2. Atoms and Elements (4.1) • Just like the grouping of spices or candy, the elements have their own spot on the chart.

  3. Elements • Look at the painting, how do you think the artist made the painting?

  4. Theories of Elements • John Dalton-English chemist

  5. Atoms • Atoms: the smallest part of an element that cannot be made smaller. • J.J. Thompson: realized that atoms had negatively charged particles AND positively charged particles.

  6. J.J. Thompson • Believed that atoms had negatively charged particles embedded in positive sphere.

  7. Rutherford • Rutherford shined a beam of light (proton) toward gold foil to prove inside of

  8. Niels Bohr Model and Cloud Model • Thought electrons orbit the nucleus similar to how planets orbiting the sun.

  9. Modern Model of an atom • The nucleus is made of neutrons and protons, surrounded by a cloud of electrons.

  10. Activity • 1. On a piece of paper, make a small circle no bigger than a dime. This represents the nucleus. • 2. Measure the diameter of the circle in centimeters. • 3. Now predict where the outer edge of this model atom would be. • 4. The diameter is around 100,000 times the diameter of its nucleus.

  11. Particles of an atom

  12. 4.2 (Organizing the Elements) • Atomic Number: Every atom of the same element has the same number of protons. The number of protons happens to be the atomic number. • Atomic number of carbon is 6, oxygen is 8, iron is 26.

  13. Isotopes • Remember, all elements have the same number of protons. All elements are also neutral, so they have the same number of electrons as protons. However, they can have different number of neutrons. • Isotopes=elements that have a different number of neutrons.

  14. Isotopes Mass Number=neutrons + protons

  15. Periodic Table of Elements • Similar to a calendar, the Periodic Table of Elements helps us organize elements by their characteristics and properties.

  16. Atomic Mass • Atomic Mass: the average mass of all of the isotopes of an element. Mendeleev

  17. Period: Horizontal Group: Vertical

  18. Periodic Table

  19. Fusion

  20. Plasma • A form of matter that consists of gas-like mixture of free electrons and nuclei of atoms that have been stripped of electrons.

  21. (4.3) Metals • Alkali Metals • Alkaline Metals • Transition Metals

  22. Alkali Metals

  23. Alkaline Metals

  24. Transition Metals

  25. Valence Electrons • Valence Electrons: The outer most electrons that an element has. • Tells us which elements will react strongly with one another

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