1. Day 25 – Daily Starter
Calculate the formula mass for the following molecules:
NaCl
(NH4)3PO4

2. I. History of the Periodic Table (p.284-285) Mendeleev Mosely

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

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

5. The Periodic Table II. Organization (p.286-291) Metallic Character
Columns & Rows
Table Sections

6. A. Metallic Character
Metals
Nonmetals
Metalloids

7. B. Table Sections Representative Elements Transition Metals
Inner Transition Metals

8. C. Columns & Rows
Group (Family)
Period

9. III. Periodic Trends (p.288-291) Terms Periodic Trends Dot Diagrams
The Periodic Table
III. Periodic Trends (p )
Terms
Periodic Trends
Dot Diagrams

10. A. Terms Valence Electrons Atomic Radius First Ionization Energy
e- in the outermost energy level
Atomic Radius
First Ionization Energy
energy required to remove an e- from a neutral atom

11. B. Periodic Trends
Atomic Radius
Increases to the LEFT and DOWN.

12. B. Periodic Trends Increasing ionization energy
Increases to the RIGHT and UP.

13. B. Periodic Trends N or Bi Ba or Ne
Which atom has the higher 1st I.E.?
(Use your Marker Board)
N or Bi
Ba or Ne

14. B. Periodic Trends N or Bi Ba or Ne N Ne
Which atom has the higher 1st I.E.?
N or Bi
Ba or Ne N Ne

15. B. Periodic Trends Be or Ba Ca or Br Which atom has the larger radius?
(Use your Marker Board)
Be or Ba
Ca or Br

16. B. Periodic Trends Be or Ba Ca or Br Ba Ca
Which atom has the larger radius?
Be or Ba
Ca or Br Ba Ca

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

18. Valence electrons The electrons on the outer-most orbital
Valence electrons of one atom combine with valence electrons of other atom(s) to form chemical bonds.
The number of valence electrons of an element is determined by its periodic table group (vertical column)

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

20. Remember…TOMORROW Atomic structure and symbols QUIZ
28 biochemical elements
You will need to know the names of elements if given the symbol or vice versa
You should be familiar with atomic structure, and…
The concept of isotopes and finding the # of neutrons if given mass and number