1. Atomic Structure & Periodic Table Trends

2. Atomic Structure What are the three main subatomic particles?
Where in the atom are those particles located?

3. Main Sub-Atomic Particles
Protons (+) – have a positive charge and an AMU of 1
Neutrons (0) – have a neutral charge and an AMU of 1
Electrons (-) – have a negative charge and a very small atomic mass

4. Brace Map – Parts of a Whole

5. C 12.01 Carbon 6 Periodic Table Info Element Name
Atomic Mass = protons and neutrons
Chemical Symbol
Atomic Number = number of protons

6. Atomic Math
Atomic Number equals the number of protons ALWAYS – a different number of protons means it’s a different element
Atomic Number MAY equal the number of electrons – a different number of electrons means you have an ion
Atomic Mass – Atomic Number equals the number of neutrons – a different number of neutrons means you have an isotope

7. Facts & Trends to Know Atomic number = number of protons (+) ALWAYS!
Atomic number = number of electrons (-) SOMETIMES! Atom must be neutral.
Atomic mass = mass of protons plus mass of neutrons
You can find the number of neutrons by subtracting the atomic number from the atomic mass
Isotopes have a different number of NEUTRONS
Ions have a different number ELECTRONS

8. More Trends Family number is a clue to the number of VALENCE ELECTRONS
Family number is a clue to charge of the ion that usually forms
The “magic number” is 8 (that is called the “OCTET RULE”)
Atoms with fewer than four electrons lose them and become CATIONS
Atoms with more than four electrons gain more and become ANIONS
Family 1, the alkali metals, are the most reactive metals
Family 17, the halogens, are the most reactive non-metals

9. More Trends
METALS are on the left, METALLOIDS are on the “stairstep” and NON- METALS are on the right
Atomic number increases across a row and down a column
Atomic mass generally increases across a row and down a column
Reactivity decreases from family 1 and 17 towards family 14, and family 18 is non-reactive
Columns generally contain the same number of valence electrons
Rows contain the same number of energy levels

10. Online Periodic Tables
Dynamic Periodic Table
Graphic Overflow
The Photographic Periodic Table

11. Periodic Table Songs (links to YouTube)
Tom Lehrer’s Periodic Table Song:
ASAP Science Periodic Table Song:
They Might Be Giants “Meet the Elements”:

12. A Boy & His Atom: the World’s Smallest Movie