Periodic Table Elements

• There are 118 elements in the periodic table
• The elements in the periodic table are arranged into groups and periods.
• Noble gases do not react aggressively.
• Xenon is a noble gas
• Elements 89-103 are called the actinides.
• Most elements in the periodic table occur naturally
• Periods are horizontal rows on the periodic table, containing elements that have increasing atomic number (protons).
• A group is a vertical column on the periodic table, containing elements with similar properties.
• Periods are horizontal lines, whereas groups are vertical lines
• Group 1 and 2 elements end in -um