Which pair of atoms can form an ionic bond?
* na, k (sodium, potassium)
* k, f (potassium, fluorine)
* f, cl (fluorine, chlorine)
* na, ne (sodium, neon)

K, F (Potassium, Fluorine)

Explanation: Ionic bonds are formed by transfer of electrons between metal and non metals.

Covalent bonds are formed by sharing of electrons between non metals.

Electronic configuration of potassium:

Potassium atom will lose one electron to gain noble gas configuration and form .

Electronic configuration of fluorine:

Fluorine atom will gain one electron to gain noble gas configuration and form .

In potassium fluoride the one electron from potassium metal gets transferred to fluorine atom and thus form an ionic bond to give

answer; protein;

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