Organizing the elements
This presentation is the property of its rightful owner.
Sponsored Links
1 / 15

Organizing the Elements PowerPoint PPT Presentation


  • 185 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

Organizing the Elements

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Organizing the elements

Organizing the Elements

Chapter 9

Lesson 1

Page 314


Mendeleev

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


Mendeleev1

Mendeleev

  • 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


Mendeleev2

Mendeleev

  • 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

  • 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

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

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 atom1

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

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

Chemical Symbol of Potassium


How is the periodic table used

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


Periods

Periods

  • 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


Groups

Groups

  • 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


Homework

Homework

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


  • Login