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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 1 elements (except hydrogen) are called <i>alkali metals</i> *Group 2 elements are called <i>alkaline earth metals</i> **Group 1 & 2 elements very reactive, since they readily lose electrons *Groups 15 and 16 are the <i>nitrogen family</i> and <i>oxygen family</i> respectively *Group 17 is called the <i>halogens</i> and are so active that they do not occur naturally *Elements in group 18 are called the <i>noble gases</i> because they do not react easily sice their valence shells are filled http://web.buddyproject.org/web017/web017/images/ptoe.gif
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