Questions A. Atomic radius versus atomic number A number of physical and chemical properties are related to the sizes o

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Questions
A. Atomic radius
versus atomic number
A number of physical
and chemical properties are related to the sizes of the atoms, but
atomic size is somewhat difficult to define. There is
no precise outer boundary of an atom. The radius is one half
the distance between the centers of two adjacent atoms. The
radius of an atom
depends on the environment in which it
is found. For bonded atoms, we customarily speak of a
covalent radius, ionic radius, and, in the case of metals, a
metallic radius. For atoms that are not bonded together, the
radius is known as the van der Waals radius. For comparison,
all radii in the above table are covalent.
(a)
cesium
(b) tungsten (c) thallium
(d)radon
4. Which
group of the main group elements contains the largest elements?
B. Ionization energy versus atomic number
1. How would you explain
ionization energy to your partner?
(a) How does the ionization energy
vary within a period and within a family?
(b) Which element on
your graph has the strongest hold of its valence electrons?
2. (a) Which electron is
lost when 1251 kJ/mol of energy are applied to a sample of chlorine
atoms?
b). Compare the ionization
energies of metals to nonmetals.
C. Melting point versus atomic number
1. Describe the trend of
melting points within a period
2. Which group of elements tends
to have the highest melting points
3. Tungsten is used in
incandescent light bulbs because it has an extremely high melting
point. Which element
on your chart could be a reasonable
replacement for tungsten? Why?
D. Electronegativity versus atomic number
1. Describe how
electronegativity varies within a period.
2. Describe how
electronegativity varies within a family.