Development of the periodic table (AQA GCSE Chemistry Combined Science): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
Which scientist made an important breakthrough in organising elements in the 19th century?
Which scientist made an important breakthrough in organising elements in the 19th century?
Mendeleev
What two things did scientists know about elements in the 1800s?
What two things did scientists know about elements in the 1800s?
Properties and atomic weights
What did scientists NOT know about in the 1800s?
What did scientists NOT know about in the 1800s?
Protons, neutrons and electrons
How was the first periodic table organised?
How was the first periodic table organised?
By atomic weight
What was a major problem with the early periodic table?
What was a major problem with the early periodic table?
Metals and non-metals mixed together
Which two very different elements ended up in the same column in the early table?
Which two very different elements ended up in the same column in the early table?
Oxygen and iron
When did Mendeleev publish his periodic table?
When did Mendeleev publish his periodic table?
1869
What did Mendeleev do that was different from earlier attempts?
What did Mendeleev do that was different from earlier attempts?
Left gaps for undiscovered elements
Why did Mendeleev sometimes swap elements around?
Why did Mendeleev sometimes swap elements around?
To match properties not just weight
Which two elements did Mendeleev swap around despite their atomic weights?
Which two elements did Mendeleev swap around despite their atomic weights?
Iodine and tellurium
Why is it called the 'periodic' table?
Why is it called the 'periodic' table?
Properties repeat at regular intervals
What proved that Mendeleev's approach was correct?
What proved that Mendeleev's approach was correct?
His predictions matched reality