Periodic Table
What is the center of the atom?
Nucleus
What is the name of the first column on the periodic table?
Alkali Metals
What is common among all atoms in each period?
Number of energy shells
What is the name of the group of elements with 2 valence electrons?
Alkaline Earth Metals
What is the name for the group of metals in the center of the periodic table?
Transitions Metals
What does the term 'valence electrons' mean?
number of electrons on outermost shell
What are the two most reactive groups of elements?
Halogens and Alkali Metals.