Electrons are arranged in orbits called ____ Models that show electrons in the energy levels are called ____. Electrons found in the outermost energy level are called ____ electrons. The number of valence electrons affects how an atom ____ with other atoms! 1st energy level can hold up to ____ electrons. The 3rd and 2nd energy level can hold up to ____ electrons. Periods on the periodic table represent the number of ____ or ____ that contain electrons. Columns, also known as ____ or ____ indicate the number of ____ electrons. Elements that are in the same ____ have similar ____, or chemical properties.

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