#24 Why did Mendeleev leave spaces in
his periodic table?
He could tell from the elements surrounding
the “holes” in his table that they must exist.
#25 What effect did the discovery of gallium have
on the acceptance of Mendeleev’s table?
His ability to predict
the properties and existence
of unknown elements made
his table much more believable
#26 What pattern is revealed when
the elements are arranged in a
periodic table in order of increasing
atomic number?
Many trends are revealed such as
electronegativity, atomic and ionic radii,
#27 Based on their locations in the
periodic table, would you expect
carbon and silicon to have similar
properties?
Yes, they
are in the
same group
#28 Identify each property below as
more characteristic
of a metal
or aof
non-metal,
think
non-metal.
oxygen gas
a. gas at room temp.
#28 Identify each property below as
non-metal,
think
more characteristic
of a metal
or aof
a piece of lead in
non-metal.
your pencil--Carbon
b. brittle
#28 Identify each property below as
more characteristic of a metal or a
non-metal.
metal: think of
c. malleable. pounding a piece
of gold into leaf with a
mallet.
think
of howbelow
well as
#28non-metal:
Identify each
property
metal
conducts electricity.
more
characteristic
of a metal ie.
or a
a wire.
non-metal.
d. poor conductor of electric current.
#28 Identify each property below as
more characteristic of a metal or a
non-metal.
metal: think of a shiny
e. shiny.
piece of silver or gold.
Metalloids
have properties
that are
#29 In general,
how are metalloids
similar
to both
different
frommetals
metalsand
andnon-metals.
nonmetals?
How a metalloid behaves depends on
the conditions.
#30 Where are the alkali metals, the
alkaline earth metals, the halogens,
and the noble gases?
#31 Which of the following are
symbols for representative elements:
Na
Mg
Fe
Ni
Cl
#32 Which noble gas does not
have eight electrons in its highest
occupied energy level?
Helium;
it only has two
all others
have 8 valence
electrons
#33 Which of these metals isn’t
a transition metal?
a. aluminum
b. silver
c. iron
d. zirconium
Transition metals are light blue in this
table
#34 Use figure 6.12 to write the
electron configuration of these
elements.
a. B b. As c. F
d. Zn e. Al
#35 Write the electron configurations
of these elements:
a. the noble gas in
period 3 Ar: 1s22s22p63s23p6
b. the metalloid in
22s22p63s23p2
Si:
1s
period 3
Na: 1s22s22p63s1
c. the alkali metal in period 3
#36 Which element in each pair
has atoms with a larger atomic
radius?
a. sodium,
lithium
#36 Which element in each pair
has atoms with a larger atomic
radius?
b. strontium
magnesium
#36 Which element in each pair
has atoms with a larger atomic
radius?
c. carbon
germanium
#36 Which element in each pair
has atoms with a larger atomic
radius?
d. selenium
oxygen
#37Explain the difference between the first and second
ionization energy of an element.
First ionization energy
is the energy
required to remove
the FIRST electron
Second ionization
energy is the energy
required to remove the
SECOND electron. It
is always GREATER
THAN the first ionization energy
#38 Which element in each pair has
a greater first ionization energy?
a. lithium
boron
Boron
#38 Which element in each pair has
a greater first ionization energy?
a. magnesium
strontium
Magnesium
#38 Which element in each pair has
a greater first ionization energy?
a. cesium
aluminum
Aluminum
#39 Arrange the following groups
of elements in order of increasing
ionization energy.
Sr
Mg
Be
#39 Arrange the following groups
of elements in order of increasing
ionization energy.
Cs
Ba
Bi
#39 Arrange the following groups
of elements in order of increasing
ionization energy.
Na
Al
S
Atomic Radius as compared
to IONIC radius
Atoms in elemental form (same #
of electrons as protons)
Ions
1
1
1
1
1