Organizing the elements
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Organizing the Elements. Chapter 9 Lesson 1 Page 314. Mendeleev. Created the first version of the periodic table in 1869 Arranged them according to their atomic masses Total of 63 elements in 1869 He discovered a set of patterns that applied to the elements. Mendeleev.

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Organizing the Elements

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Organizing the Elements

Chapter 9

Lesson 1

Page 314


  • Created the first version of the periodic table in 1869

  • Arranged them according to their atomic masses

  • Total of 63 elements in 1869

  • He discovered a set of patterns that applied to the elements


  • He knew there were certain similarities and patterns to the elements, he also knew there was more than he had already discovered about them so he did more research

  • He found: melting point, density, color, and atomic mass

  • Atomic mass- the average mass of all the isotopes of the elements

  • Isotopes- different forms of the same element


  • Mendeleev noticed that a pattern of properties appeared when he arranged the elements in order of increasing atomic mass. He found that the properties repeated regularly.

  • He put the elements with similar properties in groups

  • Read last paragraph page 315

Periodic Table

  • Periodic table- an arrangement of elements showing the repeating pattern of their properties

  • Mendeleev left blanks in his periodic table knowing that elements with the properties he predicted would later be discovered. He was right!

  • Do we still do that?

Periodic Table Info

  • What information does the periodic table contain?

  • The table is built based on atoms ( thought of as the smallest particles of

    matter, until late 1800s when

    we discovered they were

    made of smaller particles)

Parts of the atom

  • Nucleus- very center of the atom which contains protons and neutrons

  • Protons- positively charged particles (every atom of the same element has the same # of protons)

  • Atomic number- number of protons in an element used to identify elements

  • Modern periodic tables are arranged in increasing atomic number rather than weight

Parts of the atom

  • Neutrons- particles that have no charge found in the nucleus (neutral)

  • Protons and neutrons have about the same mass

  • Electrons- negatively charged particles that move around the outside of the nucleus

  • Neutral atoms has the same number of electrons and protons

Reading the Periodic Table

  • The periodic table includes, the atomic number, chemical symbol, name, and atomic mass for each element

  • Look at page 319 to see the information that is found for each element in the book’s periodic table

Chemical Symbol of Potassium

How is the Periodic Table used?

  • As you look across the table, the elements’ properties change in predictable ways

  • An element’s properties can be predicted from its location from its location in the periodic table


  • Period- the rows of the periodic table

  • Metals are located on the left

  • Non-metals on the right

  • Metalloids are found in between

  • This patter is repeated in each period


  • Modern table has 7 periods which forms 18 columns

  • Groups- columns(aka families)

  • Patter repeats in each period

  • Characteristics are similar in each group

  • Example: except for H, all elements in group 1 react violently with water


  • Figure out why the two rows at the bottom are separate from the rest of the table.

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