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Understanding the Periodic Table ____________ are simple substances that cannot be broken down. Simple substances called elements make up the ____________________________. The periodic table is made of ________________ known elements. Elements can combine to form more complex substances such as ____________, _____________, or ______________. All substances are made of _____________________. Elements come in all forms of matter (_______________, ______________, _____________) and can change depending on melting and boiling points. Some substances are made of only ____________ element. For example, an iron nail or aluminum foil. Other substances are made of _____________________________ element such a as salt, water, sugar, and brass. Circle the following substances that are elements? water oxygen iron salt nitrogen mercury sugar carbon wood boron Circle the element that is a silver color liquid is: hydrogen mercury silver carbon Circle the element that is an invisible gas: gold copper iron oxygen ________________________________________ is one of the first scientists to organize the periodic table of elements.