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Atomic Structure

Atomic Structure

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Atomic Structure

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  1. Atomic Structure

  2. Atom • Basic unit of matter • Made of subatomic particles

  3. Element • Substance made of same type of atom

  4. Protons • Positive Charge • Located in the nucleus • Mass = 1 amu • Helps make up the mass of an atom • # of protons never changes for an element • Same as atomic number

  5. Neutrons • No Charge • Located in the nucleus • Mass = 1 amu • Helps make up the mass of an atom • Can differ in atoms of the same element How to Calculate Neutrons Mass # - Atomic # = Neutrons

  6. Electrons • Negative Charge • Located in the electron cloud • Surrounds the nucleus • Move very fast! • Mass = 0 amu • Does not really count towards an atom’s mass • In neutral atoms, electrons = protons

  7. Atomic Number • Special for every element • Tells # of protons (and electrons) • Located on the periodic table (whole number)

  8. Atomic Mass • Located on periodic table • Has decimals • Average mass of the element’s isotopes

  9. Mass Number • Protons + Neutrons • Whole Number (rounded atomic mass)

  10. Practice • How many protons does nitrogen have?

  11. Practice • What is the atomic mass of calcium?

  12. Practice • What is the mass number of calcium?

  13. Practice • How many neutrons are in chlorine?

  14. Practice • Name of Element: • Atomic Number: • Atomic Mass: • Mass Number: • Protons: • Neutrons: • Electrons:

  15. Practice • Name of Element: • Atomic Number: • Atomic Mass: • Mass Number: • Protons: • Neutrons: • Electrons:

  16. Practice • Name of Element: • Atomic Number: • Atomic Mass: • Mass Number: • Protons: • Neutrons: • Electrons:

  17. Just How Small Are Atoms?

  18. Isotopes • Same element with different numbers of neutrons; therefore, different masses • EX: Carbon-12 Carbon-14 612 C6 14 C

  19. Practice • How many neutrons in Potassium-39 Potassium-41 Fluorine-19 Fluorine-18

  20. Practice • Ni-60 • Protons? • Electrons? • Mass number? • Neutrons?

  21. Practice • Magnesium-26 • Protons? • Electrons? • Mass number? • Neutrons?

  22. Practice • 1529 P • Protons? • Electrons? • Mass number? • Neutrons?

  23. Ions • Charged atom • Gain or lose 1 or more electrons • Proton number does not change

  24. Practice How many electrons in a neutral atom of Na? How many protons in Na? How many electrons in Na +1

  25. Practice How many electrons in a neutral atom of S? How many protons in S? How many electrons in S -2?