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Warm-Up 10/14/13

Warm-Up 10/14/13. The plastic baggie on your table has a collection of subatomic particles. Determine identity of the different colored papers and the total number of each subatomic particle. (Consider what particles should be present in the same amount!)

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Warm-Up 10/14/13

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  1. Warm-Up 10/14/13 • The plastic baggie on your table has a collection of subatomic particles. • Determine identity of the different colored papers and the total number of each subatomic particle. (Consider what particles should be present in the same amount!) • Provide the element name and symbol. • Write out information in proper atomic symbol notation.

  2. Ions and Isotopes Monday 10/14/13

  3. ions • Sometimes atoms do not have an equal number of protons and electrons • These atoms are called “Ions” and have a non-zero charge • This can happen if an atom gains or loses electrons in a reaction • More protons than electrons: + More electrons than protons: - 1 more proton than electrons

  4. 2nd Example

  5. Steps: Determine element symbol Add atomic number Find atomic mass Determine charge! Your turn! • Correctly write the atomic symbol: • P+=7, n0=7, e-=10 • P+=56, n0=81, e-=54

  6. answers • P+=7, n0=7, e-=10 • P+=56, n0=81, e-=54

  7. What if an atom gains or loses particles other than electrons?

  8. Gain or lose protons • You’ve changed what element you have! • (Elements are identified by the number of protons)

  9. Isotopes: gain or lose neutrons • Protons + neutrons =___________________ • Gaining or losing neutrons changes the atomic mass • For all elements, there are multiple “isotopes” • “Isotopes” are atoms with the same atomic number (protons) but different masses

  10. Back to atomic mass • Atomic masses on the periodic table are NOT whole numbers. Why? • They are weighted averages based on the masses of all isotopes for an element. • Weighted averages are not a normal average…they account for abundance (“popularity”)

  11. Some isotopes for an element are more common than others; they have a higher abundance • Example: Boron-10 has a 19.91% abundance; Boron-11 has a 80.09% abun. • The mass on the periodic table is closer to 11 than 10 because Boron-11 is more common.

  12. Your task • Complete the Subatomic Particle Counting WS…it includes information about isotopes and ions! Due tomorrow. • UPCOMING DATES • Thursday QUIZ • Tuesday TEST

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