pt scientists

Question 1

Lavoisier

Answer 1

Made the first periodic table using the list of known elements which only consisted of 33
differentiated metals and nonmetals

Question 2

Berzelius

Answer 2

developed a table of atomic weights
created a letter system to symbolize elements, eliminating the old alchemy method

Question 3

Dobereiner

Answer 3

attempted to group the elements into triads but did not work well because he couldn’t categorize many of them

Question 4

Cannizzaro

Answer 4

developed a way to measure atomic masses by element

Question 5

Newland

Answer 5

created the Law of Octaves because he noticed that certain chemical properties began to repeat but it wasn’t that practical

Question 5

Beguiler de Chancourtois

Answer 5

arranged the elements by increasing weights

Question 6

Meyer

Answer 6

made a table based off repetitive periodic properties he noticed when the elements were arranged by increasing atomic weight

Question 7

Mandeleev

Answer 7

made another table based on atomic weights arranged periodically with elements with similar properties under each other

Question 8

Ramsay

Answer 8

discovered noble gases

Question 9

Mosely

Answer 9

examined 38 different metals and discovered a new pattern, recognizing that ordering them in order of increasing nuclear charges (atomic number/number of protons) better fit the similar chemical properties

Question 10

Seaborg

Answer 10

slightly changed the periodic table by moving the inner transition metals out of the transition metal section and to below it