1. Anatomy of the Atom

2. Alkali metals
Think back to Friday …
Watch this!

3. Learning Goals We are learning to identify parts of the atom.
We are learning to draw Bohr-Rutherford diagrams.

4. in energy levels surrounding nucleus
Subatomic Particles
In each atom, there are three subatomic particles:
Name
Symbol
Relative Mass
Electric Charge
Location
Proton p
1836 1+
nucleus
Neutron n
1837
Electron e 1 1-
in energy levels surrounding nucleus

5. Anatomy of an Atom
Shells p n
Nucleus (proton and neutron)
Electron

6. Ahhhhhh, I c…
element name
atomic number
element symbol
atomic mass

7. Atomic Number identifies every element on PT
equals the amount of protons in an atom
no two elements have the same atomic number.

8. Atomic Number also tells us the number of electrons present
in all neutral atoms:
# of protons = # of electrons.

9. What if!? +

10. Cha-ching

11. Atomic mass
the mass of an atom in atomic mass units

12. Mass number the number of protons and neutrons in an atom’s nucleus.
equals the atomic mass, rounded

13. Finding Nemo … or Neutrons
To determine the number of neutrons in an element … math is needed!
# neutrons = (mass number) – (atomic number)

14. Whoa, what!?
Isotope – same elements with different numbers of neutrons
thus have a different mass
C-12 and C-14 (number indicate the mass)

15. Al Aluminum 27 13 Write aluminum in standard notation.
How many protons?
How many electrons?
How many neutrons? Al 27 13

16. Bohr-Rutherford Diagrams
Draw the nucleus as a solid circle.
Put the number of protons (atomic number) in the nucleus with the number of neutrons (mass number – atomic number) under it.
Place the number of electrons (same as protons) in orbits around the nucleus by drawing circles around the nucleus. Remember:
1st shell – 2 electrons
2nd shell – 8 electrons
3rd shell – 8 electrons

17. Example
Phosphorous!

18. Just how small are atoms?
Watch!!

19. Learning Goals We are learning to identify parts of the atom.
We are learning to draw Bohr-Rutherford diagrams.

20. Please Complete …
Bohr diagram sheet
Textbook 6.7 #1-3,5