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*A vertical column in the periodic table is called a <b>group</b> or <b>family</b> **Elements in a group all have similar chemical and physical properties **The elements in a group have the same number of electrons in their outer shell. **Going from top to bottom,each element has one more occupied energy level *Group I elements (except hydrogen) are called <i>alkali metals</i> *Group II elements are called <i>alkaline earth metals</i> **Group I & II elements very reactive, since they readily lose electrons * http://web.buddyproject.org/web017/web017/images/ptoe.gif
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