OnlineCBT
Chemistry · Classification of Elements and Periodicity in Properties
हिन्दीConsider the following statements regarding periodic properties and electronic configurations: (A) The atomic radius generally decreases across a period due to an increase in effective nuclear charge. (B) Within a group, atomic radius increases regularly with atomic number because the principal quantum number (n) increases. (C) Cations are always larger than their parent atoms due to increased electron-electron repulsion. (D) The first ionization enthalpy generally increases as we go across a period and decreases down a group. Which of the above statements are correct?
Correct answer · Option 1
(A), (B) and (D) only
Explanation
Statement (C) is incorrect because cations are smaller than their parent atoms due to the removal of electrons and higher effective nuclear charge. Statements (A), (B), and (D) are correct.
