Classification of Elements and Periodicity in Properties
Himachal Pradesh Board · Class 11 · Chemistry
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Quick Quiz: Classification of Elements and Periodicity in Properties
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Who is credited with developing the Modern Periodic Law?
How many periods are there in the Modern Periodic Table?
Which block of elements has electrons filling the d-orbitals?
What is the Modern Periodic Law based on?
Sample Questions
Which group of elements are known as noble gases?
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Group 18
Group 18 elements are noble gases with completely filled outer electron shells, making them chemically inert.
What happens to atomic radius as you move from left to right across a period?
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Decreases
Atomic radius decreases from left to right across a period due to increasing nuclear charge and electron shielding.
Which scientist proposed the Law of Octaves?
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John Newlands
John Newlands proposed the Law of Octaves in 1865, noting that every eighth element has similar properties.
What is the maximum number of elements in the sixth period?
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32
The sixth period contains 32 elements, including the lanthanide series.
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