Question

Which of the following has the highest positive electron gain enthalpy?
1)F. 2)O-. 3)Na+. 4)Mg2+

Answer 1

Explanation:

the amount of energy released when an extra electron is added to a neutral gaseous isolated atom to form monovalent Anion is called electron gain enthalpy.

down the group in the periodic table it decreases and along the period it increases.

fluorine is less negative than that of chlorine because of very compact size of fluorine.

Answer 2

Answer:

Fluorine across a period the electron affinity increases as atomic size decreases. But for neon which is stable having maximum number of electrons in their outermost she'll die to which Electronic repulsion is maximum and in coming electrons do not experience any attractive force

Explanation:

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