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Cornell Name: Date: Notes Topic: Periodic Table Period: Essential Question: How are elements organized on the periodic table, and how does this organization relate to the periodic properties? What information is given in each element box? How is the Periodic Table arranged and what are the The periodic table is arranged by the number of protons periodic properties? in an atom, this is called the atomic number. The horizontal rows on a periodic table are called periods. As you move from left to right across a period… • The number of protons increases • The number of valence electrons increases by 1 • Atomic size (volume) decreases As you move down from one period to the next • The number of energy levels (orbitals) increases • The atomic size (volume) increases A column is called a Family or Group , these atoms • Share similar properties • Have the same number of valence electrons What are the different Elements that have the same number of protons and names that we call electrons are called atoms. elements and why? If an atom has a different number of neutrons than protons it is called an isotope. If an element looses an electron it has a po sitive charge and is now called a cation. If an element gains an electron it has a negative charge and is called an anion. Summary
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