Answer:
- The halogens have electron configurations that end in ns2np5.
Explanation:
Halogen: The elements of group 17 of periodic table are halogens like F, Cl, Br, I etc. They have 7 valence shells electrons. The electronic configurations of each halogen is given as follow
- F = [He]2s∧2 2p∧5
- Cl = [Ne] 3s∧2 3p∧5
- Br = [Ar] 4s∧2 3d∧10 4p∧5
- I = [Kr]5s∧2 4d∧10 5p∧5
From electronic configurations, it is cleared only halogens have valence shell elctrons in ns∧2 np∧5.
Transition elements: In transitions elements , electronic configuration ended in d- orbital.
Inner transition elements: In transitions elements , electronic configuration ended in f- orbital.
Nobel gases: Nobel gases elements have complete valence shells, Eight electrons like this ns2np6.
