Which of the following is the correct order of ionisation energy? (1) `Be^(+) gt Be` (2) `Be gt Be^(+)` (3) `C gt Be` (4) `B gt Be`

Question

Which of the following is the correct order of ionisation energy? (1) `Be^(+) gt Be` (2) `Be gt Be^(+)` (3) `C gt Be` (4) `B gt Be`

Which of the following is the correct order of ionisation energy?
(1) `Be^(+) gt Be` (2) `Be gt Be^(+)`
(3) `C gt Be` (4) `B gt Be`
A. 2,3
B. 3,4
C. 1,3
D. 1,4

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - C
(1) `Be` has completely filled stable valence shell configuration i.e. `2s^(2)` while in `Be^(+)` because of positive charge, the removal of electron requires much higher energy. So, ionisation energy of `Be^(+)` is greater than `Be`
(3) Across the period, atomic size decreases and nuclear charge increases and thus valence shell electron(s) is//are tightly held by nucleus. So, ionisation energy of `C` is greater than `Be`.