Position in the periodic table.
1. What is the difference between a period and a group on the periodic table of elements?
2. How does the number of valence electrons in sodium (Na) compare to the number of
valence electrons in calcium (Ca)?
A. Na has one more valence electron than Ca.
B. Na and Ca have an equal number of valence electrons.
C. Na has two fewer valence electrons than Ca.
D. Na has one fewer valence electron than Ca.
Bond Formation