The correct decreasing order of first ionisation enthalpies of five elements of the second period is
![Shaneylee18 Shaneylee18](http://eanshub.com/wp-content/uploads/wpforo/avatars/shaneylee18_9.jpg)
The correct decreasing order of first ionisation enthalpies of five elements of the second period is
(a) Be > B > C > N > F
(b) N > F > C > B > Be
(c) F > N > C > Be > B
(d) N > F > B > C > Be
![Freddie12 Freddie12](http://eanshub.com/wp-content/uploads/wpforo/avatars/freddie12_10.jpg)
(c) F > N > C > Be > B
Explanation:
As we move along the period, the atomic size decreases due to increase in nuclear charge. Therefore, it is more difficult to remove electron from an atom. Hence the sequence of first ionization enthalpy in decreasing order is
F > N > C > Be > B
But ionization enthalpy of boron is less as compared to beryllium because first electron in boron is to be removed from p-orbital while in beryllium, it is to be removed from s-orbital.
As s-orbital is closer to nucleus in comparison to p-orbital thus energy required to remove an electron from s-orbital is greater.
-
Assertion: Both Be and Al can form complexes such as BeF4^2- and AlF6^3- respectively, BeF6^3- is not formed.
4 years ago
-
Assertion: Element has a tendency to lose the electron(s) to attain the stable configuration.
4 years ago
-
Assertion: Electron affinity refers to an isolated atom’s attraction for an additional electron while electronegativity
4 years ago
-
Assertion: First ionization energy for nitrogen is lower than oxygen.
4 years ago
-
The law of triads is applicable to a group of
4 years ago
- 321 Forums
- 27.3 K Topics
- 53.8 K Posts
- 0 Online
- 12.4 K Members