(8th) Chapter 4-2 Cornell Notes “Organizing the Elements”

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Presentation transcript:

(8th) Chapter 4-2 Cornell Notes “Organizing the Elements”

(8th) Chapter 4-2 Cornell Notes Key Questions How did Mendeleev discover the pattern that led to the periodic table? How are the elements organized in the modern periodic table?

(8th) Chapter 4-2 Cornell Notes Key Terms atomic mass periodic table period group chemical symbol

(8th) Chapter 4-2 Cornell Notes 1869 Mendeleev discovered pattern of properties when…..; Paragraph 1 he arranged elements in increasing atomic mass.

(8th) Chapter 4-2 Cornell Notes Mendeleev: published 1 st periodic table; properties repeat in each period or row; left 3 blank spaces, predicted new elements. Paragraph 2

(8th) Chapter 4-2 Cornell Notes periodic table updated; protons discovered, led to order by atomic mass. Paragraph 3

(8th) Chapter 4-2 Cornell Notes element properties predicted by location on table; period: horizontal row, seven periods; left to right properties change in pattern. Paragraph 4

(8th) Chapter 4-2 Cornell Notes elements in a column called group or family; 1 to 18 left to right. Paragraph 5

(8th) Chapter 4-2 Cornell Notes modern periodic table contains over 100 elements; each square contains: 1. atomic number 2. chemical symbol; 3. name; 4. atomic mass; chemical symbol usually 1 or 2 letters. Paragraph 6

(8th) Chapter 4-2 Cornell Notes atomic mass appears below element name; average of masses of different isotopes of an element. Paragraph 7

(8th) Chapter 4-3 Cornell Notes elements below main table = lanthanides, actinides; lanthanides + metals = alloys; Paragraph 8