“FIND THE "MISSING ELEMENTS"
Part I: Paint Chip Periodic Table
In this activity, you will be creating your own incomplete periodic table using paint
strips. You will be using "color" as a guide. As you start to arrange your periodic
table, you will notice 'holes' or missing colors. Your task will be to arrange your
periodic table, so that you will be able to determine the missing elements/colors.
You will then determine the missing element's color, shade and location.
When you get your materials (1 baggie with 32 color strips):
1. Arrange the color strips by color, left to right, in the order of the rainbow
(ROY G BIV).
2. Arrange the shades of each color, top to bottom, from light to dark.
3. Now you will notice the 'holes' in your periodic table.
4. Using colored pencils, sketch or give a name to the colors and locations of the
paint strips that are missing colors to form a COMPLETE periodic table.
5. Answer the conclusion questions in complete sentences.
Questions:
(1) Explain how you arranged your chips to form a periodic table with rows
(periods) and columns (groups).
(2) a) Describe the properties of the missing paint chips.
b) Ask your teacher for the envelope containing the "missing elements" for
your set. Were you able to predict the properties (color and shade) of the
three elements not yet discovered? Why or why not?
(3) Explain the value of your periodic table in predicting properties of paint
chips, and explain how chemists used the Periodic Table to predict the
existence of unknown elements.
The atomic number is one and the atomic mass (weight) is 1.00794
amu. The number of neutrons in the most common isotope is 0 and
the number of electrons is one. Hydrogen has three common isotopes.
The simplest isotope, called protium, is just ordinary hydrogen. The
second, a stable isotope called deuterium, was discovered in 1932. The
third isotope, tritium, was discovered in 1934. It has one electron.
Melting Point:13.81 K (-259.34°C or -434.81°F)Boiling Point:20.28 K (252.87°C or -423.17°F)Density:0.00008988 grams per cubic
centimeter
Hydrogen is a colourless, odourless gas that burns and can form an
explosive mixture with air. The element, Hydrogen that was discovered
by Henry Cavendish. The name was derived from the Greek ‘Hydro
genes” meaning water forming. It is found in mines, oils, and gas wells
and is manufactured from methane gas and by electrolysis of water
aqueous . Hydrogen is used for mental refining, balloons, fertilizers,
plastics, salts, and pharmaceuticals. It’s also used for Ammonia,
cyclopean, and methanol.
http://www.chemsoc.org/viselements/pages/hyd
rogen.html
http://chemicalelements.com/
http://www.bayerus.com/msms/fun/pages/perio
dic/i_table.html
NAME
1
Hydrogen
2
Sodium
SYMBOL
NAME
3
4
Nitrogen
C
9
Calcium
10
11
Neon
5
6
Sulfur
7
Iodine
O2
12
13
Boron
He
14
15
Chlorine
SYMBOL
Al
Hg
8
Si
16
Lithium
http://www.funbrain.
com/periodic/
In the element key for Carbon,
6 is the atomic number (number of protons)
C is the symbol
12.011 is the atomic mass (average mass of all the
isotopes)
The isotopes of carbon can have mass numbers of
12, 13, or 14 (looking at the atomic mass – which
do you think occurs most frequently in nature?)
Atomic number
Atomic Mass
Protons
Neutrons
Electrons
Isotopes
Elements and the
Periodic Table
Using the Periodic Table
Alkali Metals
Halogens
Alkali Earth Metals
Noble Gases
C6 (2.4)
Transition metals
 Label the first 18 elements with the chemical symbol, atomic number,
and electronic configuration
 Label the groups and periods
 Identify the names of the different families/groups
 Find a way to distinguish between metals and non-metals
 Label the groups with the number of electrons in the outer energy level
PERIODIC TABLE
The Periodic Table is
my idea!
Dmitri Mendeleev
(1834-1907)
Periodic table
• Table of elements
arranged
according to
repeated pattern
of properties.
GROUPS
vertical columns are called
groups or families with
same number of valence
electrons.


similar chemical properties
has 8 groups plus a block
of transition metals

1
Alkali Metals
2
Alkaline Earth Metals
3-12
Transition Metals
17
Halogens
18
Inert or Noble Gases
PERIODS

horizontal rows numbered 1
to 7 going down
1 only hydrogen and helium
2 Lithium to Neon
3 Sodium to Argon …
Zig-Zag line separates
metals (left) from non-metals
(right)
 From
left to right across
a period, Most Metallic (Grp 1)
to Most Non-Metallic (Grp VII)

Hmmm...
The number
system
varies

Most metallic - bottom and left
Metal Heroes
Most nonmetallic – top and right (not group 8)
White