Question

Which of the following pairs of elements are likely to form ionic compounds? Check all that apply.
sodium and potassium
nitrogen and iodine
potassium and sulfur
chlorine and bromine
helium and oxygen
magnesium and chlorine

Answer 1

Answer : The correct pairs of elements likely to form ionic compounds are, potassium and sulfur, magnesium and chlorine.

Explanation :

Ionic compound : These are the compounds in which the atoms are bonded through the ionic bond. The ionic bond are formed by the complete transfer of the electrons.

That means, the atom which looses the electron is considered as an electropositive atom and the atom which gains the electron is considered as an electronegative atom.

And these bonds are formed between one metal and one non-metal.

From the given pairs of elements, potassium and sulfur, magnesium and chlorine are form ionic compound because potassium and magnesium are the metals and sulfur and chlorine are the non-metals. So, they can easily form ionic compound by the complete transfer of electrons.

While the other pairs, sodium and potassium are the metals, nitrogen and iodine, chlorine and bromine, helium and oxygen are the non-metals. They do not form ionic bond.

Hence, the correct pairs of elements likely to form ionic compounds are, potassium and sulfur, magnesium and chlorine.

Answer 2

The set of pairs of elements whose atoms will combine to form a compound called ionic compound are:

• sodium and potassium
• magnesium and chlorine

Recall the following about ionic compounds:

• Ionic compounds are formed when the number of electrons lost by one atom is equivalent to the number of electrons the other atom receives.
• In an ionic compound, the negative and opposite charges of each atom is what forms the ionic bonds of the compound.
• Metals and non-metals will easily form iconic compounds.
• A typical example of the ionic bonding that takes place between a metal and a non-metal is shown in the image attached below.

Thus:

The attraction between the atoms of Potassium and Sulfur forms and iconic bond.

The attraction between the atoms of Magnesium and Chlorine forms and iconic bond.

Therefore, the set of pairs of elements whose atoms will combine to form a compound called ionic compound are:

• sodium and potassium
• magnesium and chlorine

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