Paper 1 - Periodic table - Mendeleev

Question 1

How did Mendeleev organise his elements vertically?

Answer 1

The vertical columns in Mendeleev’s periodic table were based on their properties

Question 2

How did Mendeleev organise his elements horizontally?

Answer 2

The horizontal rows in Mendeleev’s periodic table were in order of their increasing atomic mass

Question 3

Why did Mendeleev leave gaps in his periodic table?

Answer 3

Mendeleev left gaps in his periodic table to make room for elements that had not yet been discovered

Question 4

Why will Mendeleev’s periodic table not work now?

Answer 4

Mendeleev’s periodic table will not work today because he left no space for isotopes that were poorly understood in his time

Question 5

How many elements had been discovered at the time that Mendeleev made his periodic table?

Answer 5

There were only 50 elements that had been discovered during the creation of Mendeleev’s periodic table