Complete the following with the terms "new element", ion, isotope, or molecule.
Directions: Give the total number of electrons and
the number of valence electrons for each element
listed below.
1. Hydrogen
Directions: Give the element names for the element
in the given period with the given number of valence
electrons.
1. 2nd period, 5 valence electrons
2. Beryllium
2. 5th period, 1 valence electron
3. Carbon
3. 3rd period, 7 valence electrons
4. Neon
4. 6th period, 8 valence electrons
5. Chlorine
5. 4th period, 3 valence electrons
6. Sodium
6. 3rd period, 6 valence electrons
7. Aluminum
7. 1st period, 2 valence electrons
8. Arsenic
8. 5th period, 8 valence electron
9. Sulfur
9. 3rd period, 4 valence electrons
10. Bromine
10. 2nd period, 6 valence electrons
Fill in the isotope names and any missing information on the chart. Use your periodic table and the
information provided. Assume all atoms are neutral.
# of protons
# of protons
25
32
# of neutrons
# of neutrons
17
# of electrons
15
30
# of electrons
32
Metals
Metalloids
Non-metals
Place the properties below in the chart above in either metals, non-metals, or metalloids.
 usually solid at
 dull or shiny
 usually brittle
 malleable (can be
room temperature
bent and pounded
 some conduct
 poor conductors
into thin sheets)
heat and
of heat and
 good conductors
of heat and
electricity, some
electricity
 often make good
electricity
do not
semiconductors
 usually less dense
 ductile (can be
 often ductile
 tend to gain
 usually low
drawn into wire)
electrons in
melting point of
 often malleable
chemical
solids
 usually dense
 may gain or lose
reactions
 dull appearance
electrons in
 high luster (shiny)

Most have a low
reactions
 Most have a high
 most have a very
boiling point
boiling point
high melting
 readily lose
electrons
point