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# 4-2 Notes - PowerPoint PPT Presentation

4-2 Notes. Organizing the Elements. Mendeleev’s Periodic Table. 1869 Russian scientist who discovered a pattern of the elements Arranged the elements in order of increasing atomic mass (average mass of all the isotopes of an element) Then he lined them up in groups of similar properties

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### 4-2 Notes

Organizing the Elements

• 1869 Russian scientist who discovered a pattern of the elements

• Arranged the elements in order of increasing atomic mass (average mass of all the isotopes of an element)

• Then he lined them up in groups of similar properties

• Developed the first periodic table of elements

• Contained 63 elements

• Changed as new elements were discovered

• Contains over 100 elements

• Arranged in order of increasing atomic number (not atomic mass like Mendeleev’s)

• Atomic number = number of protons in an atom of that element

• The properties of an element can be predicted from its location on the periodic table

• Elements are organized into rows and columns based on their atomic number.

• Elements are organized into rows and columns based on their atomic number.

• Elements are organized into rows and columns based on their atomic number.

• Open your books to pages 134-135

• Each colored region corresponds to a different class of elements

• Metals = blue

• Semimetals = yellow

• Nonmetals = light green

• Inert gases = dark green

• Horizontal rows

• There are 7 periods on the table, look how they are labeled on the left side of the table

• Properties within each period change in a pattern

• Notice the lanthanides and actinides have been taken out of the table and placed underneath it

• This is to save space and make the table easier to read

• Look at the expanded table on page 136

• Vertical columns

• Aka family

• Elements within the same groups have similar characteristics

• Each square in the periodic table lists four pieces of information: an element’s atomic number, chemical symbol, name, and atomic mass.

• The atomic number tells how many _________ are in an atom of the element.

• Protons

• What is the chemical symbol for lead?

• Pb

• How many protons does potassium have?

• 19

• What group number is beryllium in?

• Group 2

• What period does silver belong to?

• Period 5