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Atoms, Bonding, and the Periodic Table Electron Dot Diagrams The valence electrons of an atom are shown as dots around the symbol of the element. Complete the electron dot diagram for neon. Atoms, Bonding, and the Periodic Table Periodic Table of the Elements The periodic table is arranged in order of increasing atomic number. The number of valence electrons also increases from left to right across a period. What is the number of valence electrons for each group? Atoms, Bonding, and the Periodic Table The symbols for the elements in Periods 2 and 3 are shown below. Complete the electron dot diagrams for nitrogen, oxygen, fluorine, sodium, magnesium, aluminum, silicon, and argon. Atoms, Bonding, and the Periodic Table Groups of Elements