History Of The Periodic Table

Question 1

What did scientists discover and when?

Answer 1

• In 1913, scientists worked out that an element’s atomic number was the number of protons in atoms

Question 2

Define ‘Mass Number’

Answer 2

• Total of protons and neutrons in the nucleus of an atom

Question 3

What do we get from chemical symbols?

Answer 3

• The Mass Number - Top Number

- Atomic Number - Bottom Number

Question 4

How were elements first arranged in the Periodic Table?

Answer 4

• In order of atomic mass

Question 5

What did Scientists first do in 1800?

Answer 5

• Scientists had no idea about the structure of atoms, but they could measure the RAM of each

Question 6

What was noticed when elements were put in order of their RAM?

Answer 6

• Periodic patterns were noticed