Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
COMEDK2023Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The correct decreasing order of negative electron gain enthalpy for C , Ca , Al , F and O is

Options

  1. AF > C > O > Ca > Al
  2. BAl > F > Ca > C > O
  3. CF > O > C > Al > Ca
  4. DCa > Al > O > F > C

Correct answer

C. F > O > C > Al > Ca

Step-by-step solution

The electron gain enthalpy is the energy released when an electron is added to a neutral gaseous atom. Generally, it becomes more negative (higher magnitude) across a period from left to right and decreases down a group. The elements given are F (Group 17, Period 2), O (Group 16, Period 2), C (Group 14, Period 2), Al (Group 13, Period 3), and Ca (Group 2, Period 4). Comparing the magnitudes of electron gain enthalpy: 1. F has the highest negative electron gain enthalpy among these due to its small size and high eff

Practice Classification of Elements and Periodicity in Properties on Quantrex Academy →

More from Classification of Elements and Periodicity in Properties

Which of the following is an INCORRECT match? 2026Match List-I with List-II: List-I (Element-Atomic number) List-II (Position in periodic table) (a) Ra – 88 (i) 4^ th period, 13^ th group (b) Ga – 31 (ii) 6^ th period, 6^ th group 2026Which element from following has positive electron gain enthalpy? 2026Which of the following elements belongs to group 2 and sixth period of periodic table? 2026Identify the most electronegative element by the following. 2026Identify increasing order of acidity for following diprotic acids in aqueous solutions. 2026Identify the group of periodic table that contains element Astatine. 2026What happens to the size of atoms in p-block elements when we move from left to right in the same period? 2026 Full Classification of Elements and Periodicity in Properties list All COMEDK PYQs