Which of the following statements is`//are` correct ?

Options

A. Successive `IE's` are lower.
B. Less energy is required to remove an electron from a
half-filled shell or completely filled shell.
C. `IE_(1)` or `Al lt IE_(1)` of `Mg`
D. `IE_(1)` of `Be gt IE_(1)` of `B`

Answer

C, D

Explanation

False. `IE_(3) gt gt IE_(2) gt IE_(1)`
Successive `IE's` are always higher as the force of attraction increases towards nucleus due to lesser number of electrons.
b. False. More energy is required to remove an electron from an atom which has table (half-filled or full filled) electronic configuration.
c and d. True. Due to penetration effect.