Modern periodic law and present form of periodic table; electronic configuration; periodic trends in 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 · HARD
Consider four consecutive elements in the third period with atomic numbers Z, Z+1, Z+2, and Z+3. The first ionization energies follow the order I₁(Z) < I₁(Z+1) < I₁(Z+3) < I₁(Z+2). Which of the following represents element Z?
Q2 · Classification of Elements and Periodicity in Properties · MEDIUM
An element X in the third period has the highest electronegativity among all elements in that period. Another element Y from the same period forms a stable oxide having the formula Y₂O₅. Which of the following statements is correct?
Q3 · Classification of Elements and Periodicity in Properties · EASY
The element with electronic configuration [Ar] 3d⁵ 4s¹ belongs to which group and period?