Classification of Elements and Periodicity in Properties

Modern Periodic Law was given by which of the following scientists?

Which of the following elements has the most negative electron gain enthalpy?

Which of the following oxide is amphoteric in nature?

Why is the first ionization enthalpy of Nitrogen ($N$) higher than that of Oxygen ($O$)?

The correct decreasing order of ionic radii for the isoelectronic species $N^{3-}, O^{2-}, F^-$ is:

Elements present after Uranium (atomic number 92) in the periodic table are called:

Which of the following species has the smallest size?

On Pauling's electronegativity scale, which element is assigned the highest value of 4.0?

Which statement regarding second ionization enthalpy ($IE_2$) compared to first ionization enthalpy ($IE_1$) is always correct?

Beryllium ($Be$) shows a diagonal relationship with which of the following elements?