Essential Chemistry for IGCSE - Formulae And Equations (Section 2 - No. 2)
Which of the following pairs of elements is likely to form an ionic compound?
Carbon and Oxygen
Hydrogen and Hydrogen
Sodium and Chlorine
Iron and Iron
Explanation
Ionic compounds are formed between a metal and a non-metal. Sodium (Na) is a metal and chlorine (Cl) is a non-metal.
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