_ Mn _______ 54.9 Fill in the following information: Atomic Number: _ Element Name: _____ # Protons _ # Electrons ___ # Neutrons.

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___ Mn _____________ 54.9 Fill in the following information: Atomic Number: _______ Element Name: _________ # Protons _____ # Electrons _____ # Neutrons _____ Unit 3: Chemistry. Groups, Periods, and Families. Bell Ringer

Unit 3: Chemistry. Groups, Periods, and Families.

In the 1860’s, Russian chemist, Dmitri Mendeleev noticed that elements were periodic, meaning they had a regular, repeating pattern. He arranged the elements by atomic number (proton number) Unit 3: Chemistry. Groups, Periods, and Families. Discovering a Pattern

Each horizontal row of elements on the periodic table is called a period Unit 3: Chemistry. Groups, Periods, and Families. Periods

The elements in each period have the same number of electron shells (electron cloud levels) Unit 3: Chemistry. Groups, Periods, and Families. Periods

Unit 3: Chemistry. Groups, Periods, and Families. Periods

 Each vertical column on the periodic table is called a group. Unit 3: Chemistry. Groups, Periods, and Families. Groups

Each element in a group has the same number of electrons in their outer orbital (shell) The groups are also given family names Unit 3: Chemistry. Groups, Periods, and Families. Groups

Except He, it has 2 electrons Unit 3: Chemistry. Groups, Periods, and Families. Groups