Periods & Groups: Reading the Periodic Table

Learn to read the Periodic Table! Identify elements and understand groups/periods.

Groups and Periods Vocabulary Matching Match the vocabulary word to the correct definition. Click on the orange dots and drag to correct definition. Periods tells the number of energy levels. Groups tells the number of valence electrons. Valence Electrons Electrons on the outermost shell of an atom Atomic Number Equal to the number of protons Atomic Mass Equal to the number of protons + neutrons Protons Gives the identity of an element Energy Levels The rings around the nucleus Periods Groups Practice Fill in the chart below. Element Period Group Energy Levels Valence Electrons Potassium 4 1 4 1 Magnesium 3 2 3 2 Silicon 3 14 3 4 Oxygen 2 16 2 6 Lithium 2 1 2 1 Reflect on the data table above. Complete the fill in the blanks below. Magnesium and silicon are in the same period. When elements are in the same period they will have the same number of rings around the nucleus. Potassium and lithium are in the same group or family. When elements are in the same group they will have similar chemical reactions. They also have the same number of valence electrons. Clue Element Identify the element with 79 protons. Gold Identify the element with 4 valence electrons and the least mass Carbon Identify the metal in period 3, group 1. Sodium Identify the nonmetal in period 4 that has on less proton than Kr. Bromine Aluminum Identify a nonmetal in period 3 that has one more proton than Silicon. Phosphorus Identify the element with 47 protons Silver Identify the element in period 5, group 17 (7A) Iodine Identify the element with 5 valence electrons in period 4. Arsenic Identify the element with 3 energy levels and 2 valence electrons Magnesium Lithium Identify the element with 5 neutrons Beryllium Identify that has 8 valence electrons and 3 energy levels. Argon Identify a nonmetal with 1 valence electron Hydrogen Identify the metalloid in group 13 Boron Identify the element that has 5 valence electrons and 2 energy levels Nitrogen Identify the element with 2 valence electrons in group 18 (8A). Helium