Which elements have electron configurations that end in ns2np5? a) noble gases b) transition metals c) halogens d) inner transition metals

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

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.

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