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?
Q4 · Classification of Elements and Periodicity in Properties · MEDIUM
Consider the following statements regarding periodic properties: (I) The first ionization energy of nitrogen is greater than that of oxygen. (II) The electron affinity of fluorine is less than that of chlorine. (III) The atomic radius of gallium is smaller than that of aluminum. Which of the above statements is/are correct?