Development of the periodic table (AQA GCSE Chemistry): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What did 19th century scientists know about elements?
What did 19th century scientists know about elements?
Their atomic weight
What did 19th century scientists NOT know about?
What did 19th century scientists NOT know about?
Atomic numbers
How did early scientists first organize the periodic table?
How did early scientists first organize the periodic table?
By atomic weight
How many columns did the first periodic table have?
How many columns did the first periodic table have?
Seven
After which element did the pattern break down in early tables?
After which element did the pattern break down in early tables?
Calcium
What problem occurred with metals and non-metals in early tables?
What problem occurred with metals and non-metals in early tables?
They ended up in same columns
When did Mendeleev publish his periodic table?
When did Mendeleev publish his periodic table?
1869
What did Mendeleev do to improve the periodic table?
What did Mendeleev do to improve the periodic table?
Left gaps for unknown elements
Why did Mendeleev swap iodine and tellurium?
Why did Mendeleev swap iodine and tellurium?
To match properties to groups
What proved Mendeleev's table was correct?
What proved Mendeleev's table was correct?
Predictions matched discoveries