Download ch 15A lab - periodic table

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Transcript
Pre-Lab 15 A: Periodic Table
Purpose
• Virtually all the matter you see is made up
of combinations of elements. Scientists
know of 118 different elements, of which
about 90 occur naturally.
• Each element has its own unique kind of
atom.
• The periodic table is a chart that shows all
of the elements in order of increasing
atomic number.
Key Question
• How is the periodic table organized?
Background
• Define:
– Period
– Group
– Periodicity
Drawing
draw this:
Procedure
Every element is given a symbol of one or two letters.
For example, the symbol for hydrogen is a capital
letter H. The symbol for lithium is two letters, Li.
Each element also has a unique number called the
atomic number.
The periodic table is a chart that shows the elements in
an arrangement that helps us recognize groups of
elements with similar properties.
Your drawing shows the shape of the periodic table and
the first few elements in sequence from left to right.
The elements are arranged from lowest to highest
atomic number.
Section1:
There is a periodic table on page 88 of your lab book
Using the this table as a guide, build the periodic table
out of the periodic table tiles.
The only tile you should use yellow-side up is the
hydrogen tile.
The colors will show a pattern when you are finished.
There is a tricky part near the bottom of the table. The
table breaks off between element 56 (Ba) and element
71 (Lu), and fills in the first of two long rows
underneath the main part of the chart.
You must have your chart checked and signed by the
teacher when completed
Post Lab 15A: periodic table
Purpose
• Virtually all the matter you see is made up
of combinations of elements. Scientists
know of 118 different elements, of which
about 90 occur naturally.
• Each element has its own unique kind of
atom.
• The periodic table is a chart that shows all
of the elements in order of increasing
atomic number.
Key Question
• How is the periodic table organized?
Background
• Define:
– Period
– Group
– periodicity
SECTION 2:
•
•
•
•
a. Which elements are in group 1?
b. Which elements are in group 8?
c. Name three transition metals.
d. To which group does chlorine belong?
What other elements are in that group?
• e. Which elements are in the 2nd period?
Section 3:
• a. Each period of the periodic table contains
only a certain number of elements. What
does this have to do with the structure of the
atom?
• b. Which group of the periodic table above
contains the element argon?
• What characteristic do the elements in this
group share?
• c. Which group contains the element
carbon?
• What characteristic do the elements in this
group share?