Chemistry · Classification of Elements and Periodicity in Properties

Consider the following statements regarding periodic trends: (A) The first ionization enthalpy of oxygen is smaller than that of nitrogen due to inter-electron repulsion arising from pairing in \( 2p \)-orbitals. (B) Noble gases have large positive electron gain enthalpies. (C) Electronegativity is a measurable physical quantity. (D) The maximum covalency of boron is 4. Which of the above statements are correct?

Correct answer · Option 2

(A), (B) and (D) only

Statements (A), (B), and (D) are correct. Statement (C) is incorrect because electronegativity is not a measurable quantity.