Unit: Chemistry Lesson 2: Organizing the Elements Essential Questions:

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Presentation transcript:

Unit: Chemistry Lesson 2: Organizing the Elements Essential Questions: 1.) What did Mendeleev discover? 2.) What information does the periodic table contain? 3.) How is the periodic table useful?

What did Mendeleev discover? Periodic table- an arrangement of the elements showing a pattern of their properties

What information does the Periodic Table contain? Atomic number- the number of protons in the nucleus of an atom

Chemical symbol- a one or two letter abbreviation for an element

Atomic mass- average mass of all the isotopes of that element

How is the Periodic Table useful? Periods- rows Groups- columns