1. Ch. 10 - Atomic Structure Structure of the Atom (p.270-271, 276-277)
Chemical Symbols
Subatomic Particles

2. Metal that forms bright blue solid compounds.
Chemical Symbols
Capitals matter!
Element symbols contain ONE capital letter followed by lowercase letter(s) if necessary.
Metal that forms bright blue solid compounds.
Co vs. CO
Poisonous gas.

3. Subatomic Particles in a neutral atom Most of the atom’s mass.
NUCLEUS
ELECTRONS
in a neutral atom
PROTONS
NEUTRONS
NEGATIVE CHARGE
POSITIVE CHARGE
NEUTRAL CHARGE
Most of the atom’s mass.
Atomic Number
equals the # of...

4. Meet the “Atoms” Family!
Atoms Family Album

5. ATOMIC NUMBER, #6
Atomic
mass
CHEMICAL SYMBOL = “C”
element

6. Ch. 10 - Atomic Structure Electron Cloud Model (p.272-274) Orbital
Energy Levels
Bohr Model Diagrams

7. Orbital Region where there is 90% probability of finding an electron.
Can’t pinpoint the location of an electron.
Density of dots represents degree of probability.

8. Energy Levels Electrons can only exist at certain energy levels.
Low energy levels are close to the nucleus.

9. Bohr Model Diagrams
Simplified energy levels using Bohr’s idea of circular orbits.
Can replace with: 3p 4n
Lithium
Atomic #: 3
Mass:
# of p: 3
# of e: 3
# of n: 4 e- e- p n
Maximum e-
Level 1 2e-
Level 2 8e-
Level 3 18e-
Level 4 32e- e-

10. Bohr Diagram - Sodium e e e e e 11p e 12n e Maximum e- e e Level 1 2e-

11. Bohr Model Activity Choose a number between 1 & 18.
Find your element by the atomic number you picked.
Draw a Bohr Model diagram for your element on your marker board.
Round off the mass listed on the table and subtract the atomic # to find the # of neutrons.
Abbreviate the # of ‘p’ and ‘n’ in the nucleus.
Have a partner check your drawing.
Repeat with a new element.

12. Subatomic Particles p. 276-277
Quarks
6 types He
3 quarks = 1 proton or 1 neutron

13. Masses of Atoms (p.278-281) Atomic Mass Mass Number Isotopes
Ch Atomic Structure
Masses of Atoms
(p )
Atomic Mass
Mass Number
Isotopes

14. Atomic Mass atomic mass unit (amu) 1 amu = 1/12 the mass of a 12C atom
1 proton = 1 amu 1 neutron = 1 amu
1amu = 1.67  g
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15. Mass Number Sum of the protons and neutrons in the nucleus of an atom.
© Addison-Wesley Publishing Company, Inc.
Always a whole number.
# of neutrons = mass # - atomic #

16. Calculate the # of P, N, and E of each of the following elementsB,
P=5
E=5
N=6 O,
P=8
E=8
N=8
As,
P=33
E=33
N=42

17. Isotopes Mass # Atomic #
Atoms of the same element with different numbers of neutrons.
Isotope symbol:
Mass #
Atomic #
“Carbon-12”

18. Isotopes
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19. Isotopes Average Atomic Mass reported on Periodic Table
weighted average of all isotopes
Avg.
Atomic
Mass

20. Isotopes
EX: About 8 out of 10 chlorine atoms are chlorine-35. Two out of 10 are chlorine-37.
Avg.
Atomic
Mass
35.4 u

21. I. History of the Periodic Table (p.284-285) Mendeleev Mosely
Ch The Periodic Table
I. History of the Periodic Table
(p )
Mendeleev
Mosely

22. Dmitri Mendeleev Dmitri Mendeleev (1869, Russian)
Organized elements by increasing atomic mass.
Predicted the existence of undiscovered elements.

23. Henry Mosely Henry Mosely (1913, British)
Organized elements by increasing atomic number.
Fixed problems in Mendeleev’s arrangement.

24. Organization (p.286-291) arrangement Rows & Columns Table Sections
Ch The Periodic Table
Organization (p )
arrangement
Rows & Columns
Table Sections

25. Arrangement
Metals
Nonmetals
Metalloids

27. Columns & Rows
Group (Family)
Period

28. Atomic number = 6
Atomic
Mass, 12
Chemical
symbol
Element
Name

29. Periodic Trends (p.288-291) Terms Periodic Trends Dot Diagrams
Ch The Periodic Table
Periodic Trends (p )
Terms
Periodic Trends
Dot Diagrams

30. Terms
Periodic Law
Properties of elements repeat periodically when the elements are arranged by increasing atomic number.

31. Valence Electrons Valence Electrons e- in the outermost energy level
Determine how an element will react.

32. Periodic Trends
Atomic Radius
Increases to the LEFT and DOWN.

33. Periodic Trends Group # = # of valence e- (except He)
Families have similar reactivity.
Period # = # of energy levels 1A 2A
3A 4A 5A 6A 7A 8A

34. Dot Diagrams
Dots represent the valence e-.
EX: Sodium
EX: Chlorine