Unit-4 Periodic Table and Periodicity of Properties
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Unit-4 Periodic Table and Periodicity of Properties
Answer: Scandium was the eka-boron predicted by Mendeleev.
Answer: Modern periodic law: properties depend periodically on atomic number.
Answer: The first period contains only two elements.
Answer: The d-block transition series occupies groups 3 to 12.
Answer: Horizontal rows are periods; vertical columns are groups.
Answer: The seventh period is incomplete because some elements are yet to be found.
Answer: Placing lanthanides and actinides separately keeps the table compact.
Answer: Vertical columns are groups; their elements show similar properties.
Answer: Inner transition elements occupy the f-block.
Answer: The sixth period includes the lanthanides, totaling 32 elements.
Answer: The modern periodic table has 7 horizontal periods.
Answer: Transition elements fill the d-subshell of the previous shell.
Answer: Lanthanides belong to the sixth period and the f-block.
Answer: There are 18 vertical groups in the modern periodic table.
Answer: Inner transition elements fill the (n-2)f subshell.
Answer: Fluorine's tiny size causes electron repulsion, lowering its electron affinity.
Answer: The first period contains only hydrogen and helium.
Answer: Halogens have high electronegativity, with fluorine the highest.
Answer: After losing one electron, the cation holds remaining electrons more tightly.
Answer: The second and third periods are short periods with 8 elements each.