Question

Which of the following pair of elements would have more negative electron gain enthalpy?explain
i)N or O ii)S or O iii)C or Si

Answer 1

Answer:

i) O

ii) O

iii) C

Explanation:

As we move from left to right across a period in the modern periodic table, the atomic size decreases and so negative electron gain enthalpy increases.

As we move from top to bottom across a group in the modern periodic table, the atomic size increases and so the negative electron gain enthalpy decreases.