the history of the modern periodic table

Question 1

during the ____________, chemists began to categorize the elements according to similarities in their physical and chemical properties

Answer 1

19th century

Question 2

in ________, he classified some elements in groups of three, which he called ________.

Answer 2

johann dobereiner
1829
triads

Question 3

the elements in a triad had

Answer 3

similar chemical properties and orderly physical properties

Question 4

model of triads

Answer 4

1780-1849

Question 5

in _____, he suggested that the elements be arranged in “__________” because he noticed (after arranging the elements in order of increasing atomic mass) that certain properties repeated every 8th element

Answer 5

john newlands
1863
octaves

Question 6

law of octaves

Answer 6

1838-1898

Question 7

in ______ he published a table of the elements organized by increasing atomic mass

Answer 7

dmitri mendeleev
1869

Question 8

dmitri mendeleev

Answer 8

1834-1907

Question 9

he published his own table of elements organized by increasing atomic mass

Answer 9

lothar meyer

Question 10

lothar meyer

Answer 10

1830-1895