Elements with the valence-shell electron configuration ns2np5

The answer to your question is:  Fluorine, Chlorine, Bromine, Iodine

Explanation:

Electron configuration              ns² np⁵

We observe that this electron configuration finishes in "p". Elements from groups IIIA to VIIIA finish their electron configuration in "p".

Elements in Group IIIA    finish in p¹

                    Group IVA    finish in p²

                    Group VA    finish in p³

                    Group VIA   finish in p⁴

                   Group VIIA  finish in p⁵

                    Group VIIIA finish in p⁶

Then, the list of elements with this electron configuration is:

Fluorine, Chlorine, Bromine, Iodine

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

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