1which elements had complete outer shells? give the name and symbol for each
2. what do you notice about the location of the elements in #1?
3. which elements had only one valence electron?
4. what do you notice about the localion of the elements in #3?
5. what do you notice about the number of valence electrons as you move from left to right across a
row or period in the periodic table? (na - mg - al si p s - ci - an
6. what do you notice about the number of energy levels or shells as you move down a group or
column in the periodic table? (h li - na)
7. elements are organized into families according to their physical and chemical properties. identify the
elements that you used in step 5 that belong to each family based on the number of valence
electrons. give the name and symbol for each element,
alkali metals - 1 valence electron
alkaline earth metals - 2 valence electrons
boron family - 3 valence electrons
carbon family 4 valence electrons
nitrogen family - 5 valence electrons
oxygen family - 6 valence electrons
halides - 7 valence electrons
noble gases - complete outermost shell
8. what do you notice about the location of the elements in each family?
9. how would you classily hydrogen? why?
10. predict the number of valence electrons for each element based on its location in the periodic table
of elements. you will need to use the table in your textbook
barium
load
xenon
potassium
t trimpe 2002