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Periodic Table

Periodic Table. Dmitri Mendeleev. Mendeleev invented the periodic table. He arranged the elements based on their physical and chemical properties. Atomic Mass. Atomic mass is the average mass of an atom of an element. Atomic Number. Atomic number is the number of protons in an atom.

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Periodic Table

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  1. Periodic Table

  2. Dmitri Mendeleev • Mendeleev invented the periodic table. • He arranged the elements based on their physical and chemical properties.

  3. Atomic Mass • Atomic mass is the average mass of an atom of an element.

  4. Atomic Number • Atomic number is the number of protons in an atom.

  5. Chemical Group • The set of chemicals in a column is called a chemical group. • They share similar chemical and physical properties. • Based on the Bohr model they all have the same number of electrons in their outer ring.

  6. Noble Gases • Noble gases occupy the far right column of the periodic table. • All gases at room temperature. • Very unreactive, almost never form compounds with other elements.

  7. Alkali Metals • The elements that occupy the far left column of the periodic table minus Hydrogen. • Shiny, silvery metals • Very reactive • Found only in nature as compounds.

  8. Halogens • The elements that occupy the column left of the noble gasses are called halogens. • Most reactive non-metals. • Almost always appear naturally as compounds.

  9. Hydrogen • Hydrogen is not an alkali metal. It is a unique element that has characteristics of both metals and non-metals. • Highly reactive. Found only as a compound. • Main element in all living things as well as petroleum, coal and natural gas.

  10. Periods. • The horizontal rows in the periodic table are called periods. • As you go from left to right in the periodic table the atomic numbers increase and the elements gradually change from metallic to non-metallic to noble gas.

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