When Dimitri Mendeleev developed the periodic table he left gaps for as yet undiscovered elements - VCE - SSCE Chemistry - Question 19 - 2006 - Paper 1
Question 19
When Dimitri Mendeleev developed the periodic table he left gaps for as yet undiscovered elements.
On the basis of the position of these gaps and in relation to thes... show full transcript
Worked Solution & Example Answer:When Dimitri Mendeleev developed the periodic table he left gaps for as yet undiscovered elements - VCE - SSCE Chemistry - Question 19 - 2006 - Paper 1
Step 1
A. their electron configurations.
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Answer
Mendeleev did not predict the electron configurations of undiscovered elements. His periodic table was based on atomic mass and physical properties.
Step 2
B. the occurrence of their isotopes.
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Answer
Mendeleev's predictions were not focused on isotopes. Isotopes relate to variations of elements rather than their fundamental properties.
Step 3
C. many of their physical properties.
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Mendeleev was able to predict the physical properties of undiscovered elements based on trends observed in the periodic table, making option C the correct answer.
Step 4
D. their atomic numbers and mass numbers.
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Answer
While he did make predictions regarding atomic masses, he did not understand atomic numbers as they are defined today.
