#16 How does atomic size change within
groups and across periods?
http://wps.prenhall.com/wps/media/objects/439/449969/Media_Portfolio/Chapter_07/Per
#17 When do ions form?
#18 What happens to first ionization
energy within groups and across periods.
Within groups
it tends to
be similar and
decreasing.
Across periods
it tends to
increase
dramatically
#19 Compare the size of ions to the size
of the atoms from which they form.
#20 How does electronegativity vary within
groups and across periods.
http://wps.prenhall.com/wps/media/objects/439/449969/Media_Portfolio/Chapter_07/PerT
#21 In general, how can the periodic trends
displayed by elements be explained?
Differences in electron configuration
http://center.acs.org/periodic/tools/PT.html
#22 Arrange these elements in order of
decreasing atomic size: sulfur, chlorine,
aluminum, and sodium. Does your
arrangement demonstrate a periodic trend
or a group trend?
Na
Al
S
Cl
a Periodic
trend
#23 Which element in each pair has the larger first
ionization energy?
a. sodium or
potassium?
Na
b. magnesium
or phosphorus?
P