In 1866 John Newlands produced an early version of the periodic table - AQA - GCSE Chemistry - Question 2 - 2015 - Paper 3
Question 2
In 1866 John Newlands produced an early version of the periodic table.
Part of Newlands' periodic table is shown in Figure 2.
Newlands' periodic table arranged all... show full transcript
Worked Solution & Example Answer:In 1866 John Newlands produced an early version of the periodic table - AQA - GCSE Chemistry - Question 2 - 2015 - Paper 3
Step 1
Iron (Fe) does not fit the pattern in column 7. Give a reason why.
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Answer
Iron (Fe) is a metal, while the elements in column 7 include non-metals. This difference in properties means that Fe does not match the expected pattern of elements in this column.
Step 2
Why did Mendeleev leave gaps for undiscovered elements in his periodic table?
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Answer
Mendeleev left gaps so that elements with similar properties could be placed together, allowing for the prediction of the existence and properties of undiscovered elements.
Step 3
Complete the sentence.
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Answer
The modern periodic table places the elements in order of atomic number.
Step 4
Explain why.
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Answer
Lithium, sodium, and potassium all have one electron in their outer shell (highest energy level), which is why they exhibit similar properties and often react in the same way.
