Development of the periodic table

Question 1

What did John Dalton propose about the periodic table?

Answer 1

• Triads

- Ordered by atomic mass

Question 2

What did John Newlands propose about the periodic table?

Answer 2

• Law of Octaves
• Every eight elements share similar properties.
• However, elements ordered alphabetically will do the same
• Ordered by atomic mass

Question 3

What did Mendeleev propose about the periodic table?

Answer 3

• Ordered the elements
• Found missing elements
• Ordered by atomic mass