1. The Periodic Table
Ch.5-Sec.1 (pp )

2. Dmitri
Mendeleev
1869

3. Mendeleev organized the table by
Atomic mass
This was later changed
and organized
by atomic number.

4. Get ready for a cool video clip from one of your
Favorite Science People!

5. Lets watch Bill to give us some background information
concerning the periodic table of elements.
Greatest Discoveries with Bill Nye: Chemistry

6. Describes something that occurs or repeating intervals p. 107
Periodic
Describes something that occurs
at regular
or repeating intervals p. 107

7. The Periodic Table
of Elements

8. Gaps in the Periodic Table
Why were there
gaps in the table?
p. 107
All the elements were not as yet discovered.
Mendeleev was able to predict there would be
elements to fill the gaps. In later years,
the gaps were filled as Mendeleev predicted.

9. 1914 to modern day 30 + elements have been discovered since
1914 follow the periodic
law
Fun Fact:
In the late 1800’s scientists experiments
with burning elements. They found that
each element, when heated produced
its own color “spectra.”

10. Periodic Law p. 107 The repeating chemical
properties of elements change
periodically with the atomic
numbers of the elements.

11. Atomic Number What property is used to arrange the periodic table?
All elements fit the pattern
when they were arranged by:
Atomic Number

12. + Concept Map or Atom Neutron Electron Proton Atomic Mass Atomic
Number

13. Label the diagram 7 N Nitrogen 14.01 Atomic Number Element Symbol
Element Name
Atomic mass

14. 7 Periods (rows) p. 108 P E R I O D S

15. Mini-quiz Period Group A row is known as a A column is known as a
#14 and #15

16. 18 Groups (families)
Up &
Down

17. Zigzag Line Reminds us where the metals, nonmetals,
and metalloids are.

18. Mass numbers with parenthesis are
radioactive elements’ most stable isotope

19. These names and symbols are temporary
Three letter symbols
These names and symbols are temporary
Discovered in 1994, but not approved until 2004… Ten years is a long time to wait, but you still get to name the element if you discovered it.
These elements have to be approved by
an international committee of scientists.

20. The lifting agent for the ill fated Hindenburg balloon was hydrogen
rather than the safer helium.