Question

Which of the following statement is/are incorrect?

• A. Noble gases have large positive electron gain enthalpy
• B. Electrons gain enthalpy becomes more negative with increase in the atomic number across a period
• C. The effective nuclear charge increases from left to right across a period
• D. The process of adding electrons to the atom always be endothermic

Answer 1

Answer: (D)

Statement (d) is incorrect.
It's correct form is as follows :
The process of adding electrons to the atom can either endothermic or exothermic.
Rest other statements are correct.