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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)

Sagot :

Answer: 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:

[tex][K]:19:1s^22s^22p^63s^23p^64s^1[/tex]

Potassium atom will lose one electron to gain noble gas configuration and form [tex]K^+[/tex].

[tex][K^{+}]:18:1s^22s^22p^63s^23p^6[/tex]

Electronic configuration of fluorine:

[tex][F]:9:1s^22s^22p^5[/tex]

Fluorine atom will gain one electron to gain noble gas configuration and form [tex]F^-[/tex].

[tex][F^-]:10:1s^22s^22p^6[/tex]

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

Answer:    A

Potassium (K) and Florine  (F)

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