1. Center of Attention Finally we shall place the Sun himself at the center of the Universe - Nicolaus Copernicus © 2014, Simplify Science Select LLC

2. Learning Goals Students will be able to: 1)Identify the atomic number and atomic mass based on the composition of the nucleus 2)Identify subatomic particles in the nucleus based on nuclear symbol notation. © 2014, Simplify Science Select LLC

3. What we already know… Protons and neutrons are in the nucleus The nucleus is the center of the atom © 2014, Simplify Science Select LLC

4. What we learned in the lab… Changing the protons changes the identity of the element, charge, and mass. Changing the neutrons changes the atomic mass. ©2014, Simplify Science Select LLC

5. The Nucleus The nucleus is the “center of the atom” It contains all of the positive charge It contains 99.9% of the mass Consists of both protons and neutrons © 2014, Simplify Science Select LLC

6. Proton p + = ATOMIC Number 1)Positively Charged Particle (+1) 2)Large Mass 3)Small Volume 4)Determines the identity of the element Proton in Nucleus © 2014, Simplify Science Select LLC

7. Elements and Protons The number of protons determines the element All carbon atoms have 6 protons All hydrogen atoms have 1 proton © 2014, Simplify Science Select LLC

8. Neutron n 0 1)Neutral Charged Particle 2)Large Mass 3)Small Volume Neutrons in Nucleus © 2014, Simplify Science Select LLC

9. Elements and Neutrons Neutrons contribute to the atomic mass Atomic Mass = Protons + Electrons Carbon has an atomic mass of 12 Hydrogen has an atomic mass of 1 © 2014, Simplify Science Select LLC

10. Isotopes Atoms with the same number of protons Different number of neutrons All the isotopes are the same element © 2014, Simplify Science Select LLC

11. Nuclear Symbol Notation 1)Identify the number of protons to determine the element. 2)Write the chemical symbol for the element 3)Write the atomic number on the bottom left corner of the chemical symbol 4)Write the mass number on the top left corner of the atomic symbol © 2014, Simplify Science Select LLC

12. Fundamental A-1 What is the major difference between a proton and a neutron? © 2014, Simplify Science Select LLC

13. Developing A-2 Determine the number of protons and neutrons in the element below: © 2014, Simplify Science Select LLC Top number is the atomic mass Bottom number is the atomic number 35 protons = atomic number Neutrons = atomic mass – atomic number = 78 – 36 = 42 neutrons

14. Proficient A-3 Write the correct nuclear symbol notation for the element below: 8 p +, 10 n 0 © 2014, Simplify Science Select LLC Element is oxygen Top number = Protons + Neutrons = 18 atomic mass Atomic number = 8 (# of protons) O

15. Mastery A-4 Carbon has atomic mass of: Can an atom have.0107 of a neutron or proton? Justify your answer © 2014, Simplify Science Select LLC

16. Average Atomic Mass Average atomic mass is an average of ALL the different isotopes Atomic MassPercent Abundance 1.00782503299.98% 2.0141017780.0115% 3.01604926750.0005% © 2014, Simplify Science Select LLC