Modern periodic law and present form of the periodic table; s, p, d, f block elements; periodic trends in properties — atomic and ionic radii, ionisation enthalpy, electron gain enthalpy, valence, oxidation states, electronegativity, chemical reactivity.
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Q1 · Classification of Elements and Periodicity in Properties · EASY
Which of the following elements has the largest atomic radius?
Q2 · Classification of Elements and Periodicity in Properties · MEDIUM
The first ionisation enthalpy is maximum for which of the following elements in the second period?
Q3 · Classification of Elements and Periodicity in Properties · MEDIUM
Consider the ions: O²⁻, F⁻, Na⁺, and Mg²⁺. All are isoelectronic with 10 electrons. Which ion has the smallest ionic radius?
Q4 · Classification of Elements and Periodicity in Properties · HARD
The electron gain enthalpy becomes less negative on moving down a group in the periodic table. However, for Group 17 elements, the electron gain enthalpy of fluorine is less negative than that of chlorine. What is the primary reason for this anomaly?
Q5 · Classification of Elements and Periodicity in Properties · MEDIUM
Which of the following orders is correct for the ionic radii of the given species?