1. Topic: Chemistry
Aim: Explain how elements are classified in the Periodic Table of Elements.
Do Now: next slide
HW: Atoms, Elements, Compounds and Mixtures Exam Review Sheet

2. Chromatography
Evaporation
Sieve
Filtration
Magnet

3. The substances in a mixture can be separated by physical means because
the substances are chemically combined.
the substances are chemically conded together.
the substances are physically, not chemically, mixed.

4. Sand and iron particles that are similar in size and color are mixed together in a beaker. What would be the best method of separating the particles?
Use tweezers to separate them.
Add water to the mixture.
Use a magnet to separate them.
Pour the mixture into a filter.

5. A green plant contains the green pigment chlorophyll
A green plant contains the green pigment chlorophyll. However, it also contains other pigments such as carotene and xanthophyll. How can these pigments be separated from each other?
Use tweezers to separate them.
Use filtration to separate them.
Use chromatography to separate them.
Use a sieve to separate them.

6. How can you separate sugar from a sugar water solution?
Use a magnet to separate the sugar from the water.
Use filtration to separate the sugar from the water.
Use chromatography to separate the sugar from the water.
Use evaporation to separate the sugar from the water.

7. How can you separate a solid from a liquid mixture?
Use a magnet to separate the insoluble substance from the mixture.
Use evaporation to separate the insoluble substance from the mixture
Use filtration to separate the insoluble substance from the mixture.
Use chromatography to separate the insoluble substance from the mixture.

8. Periodic Table of Elements
System of grouping elements and predict the properties of elements

9. Element Key Element name Atomic number
(make sure you leave space here)
Atomic symbol
Atomic Mass

10. Atomic number:
# of protons
Different for each element
Never changes

11. Sum of protons and neutrons
Mass number
Sum of protons and neutrons
Round the atomic mass to nearest whole number
Atomic number: 42
Atomic mass:
95.84
Mass Number: 96

12. Atomic number: 5
Atomic mass:
10.81
Mass Number: 11

13. How to determine the # of neutrons
Subtract mass number and atomic number
Atomic number: 42
Mass Number: 96
# of neutrons:
96 – 42 =
54 neutrons

14. How many neutrons are located inside an atom of boron?
Mass number
= 11
Atomic number
= 5
Mass # - Atomic #
11 - 5
= 6 neutrons

15. Mass #
= 48
# of protons
= 22
48 – 22
= 26 neutrons

16. How are elements arranged?
By Atomic number
Increases as move from L  R

17. Columns
Families or Groups
Elements have SIMILAR BUT NOT identical properties

18. Ex: Family 1 (Alkali metals):
are all soft, white, shiny metals
highly reactive

19. Ex: Family 2 (Alkaline Earth Metals)
are less reactive than alkali metals
highly reactive
are shiny

20. Topic: Chemistry
Aim: Explain how elements are classified in the Periodic Table of Elements.
Do Now: Take out your Periodic Table notes.
HW: Phases Reading Notes due Thursday.

21. Atomic number:
= 35
Mass number:
= 80
Number of neutrons:
80 – 35
= 45 neutrons

22. How many electrons does Bromine have?
When Br is neutral, it has the same number of protons and electrons.
35 electrons

23. 22 protons
22 electrons
42 protons
42 electrons
5 protons
5 electrons

24. Rows
Periods
Elements are NOT ALIKE in properties

25. 4 main categories of PT
Metals
Nonmetals
Metalloids
Noble Gases

26. Metals: 88 elements to left of zigzag line

27. Nonmetals: to right of zigzag line

28. Metalloids: along both sides of the zigzag line

29. Metalloids:
Boron, Silicon, Germanium, Arsenic, Antimony, Tellurium, Polonium, Astatine

30. Noble Gases
Group 18
Inert gases
He, Ne, Ar, Kr, Xe, Rn)

31. Noble gases glow brightly when an electric charge is passed through them, and so are used as advertising signs: neon tubes glow red, xenon blue, and krypton bluish-white; argon tubes glow pale red at low pressures, blue at high pressures.

32. 2 bottom rows: Rare Earth Elements
Lanthanoid series: can be found naturally on Earth
Actinoid series: radioactive and some not found in nature

33. Let’s summarize…
Explain how the periodic table of elements is arranged.
What does the decimal number in an element key represent?
How do you determine the mass number?
How can you determine the number of neutrons?
Identify the 4 categories of elements on the periodic table.

34. NUMBER OF NEUTRONS? Mass # = 112 # of protons = 48 112 – 48 = 64 neutrons

35. Review:
Elements in the periodic table are arranged by
atomic number
atomic weight
number of neutrons
chemical reactivity

36. 2. Which of these things will you NOT find in the periodic table?
Element symbol
Atomic weight
Atomic orbital radius
Atomic number

37. 5. Which element is a metalloid?
S (Sulfur)
Si (Silicon)
Ba (Barium)
Br (Bromine)

38. Atomic number: 22
Atomic mass:
47.87
Mass Number: 48

41. How many protons?
How many electrons?
How many neutrons? 2 2 2
4-2 =

42. 5. Volume is
the amount of matter in an object
the amount of space an object takes up.
the gravitational pull on an object.
an object's resistance to a change in motion.

43. 3. A millimeter is equal to a. 0.1m b. 0.01m c. 0.001m d. 0.0001m

44. 6. A liter of water contains
1000 mL.
b. 100 mL.
c. 10 mL.
d. 1 mL