Question

K forms the compound K₂O, which is an ionic compound that is brittle. Identify another element, M, that is likely to form a brittle, ionic compound with the formula M₂O. Justify your answer in terms of periodic trends.

Answer 1

Answer: The other element is Sodium.

Explanation:

We are given a chemical compound having formula $K_2O$

The oxidation state of potassium is +1. The group showing oxidation state as +1 is Group 1. Elements belonging to Group 1 are metals.

The oxidation state of elements belonging to same group have same number of valence electrons and thus shows same oxidation state.

Properties shown by metals:

• They are hard.
• They are solid at room temperature.
• They show lustrous property.
• They are ductile and malleable.

But, there are some exceptions. Sodium and potassium belonging to Group 1 are brittle in nature. They can be easily cut with knife.

The chemical compound having formula $M_2O$, in which oxidation state of metal is +1 and is brittle in nature.

Hence, the other element will be sodium

Answer 2

Other than potassium, Sodium will form $\rm Na_2O$, which is brittle.

Potassium is the metal of group 1 metal with oxidation number +1. The potassium with oxygen forms $\rm K_2O$. The compound is brittle in nature.

The group 1 elements have the oxidation number +1, which can form the compound with the same molecular formula. The nature of group 1 elements is ductile, hard, and malleable.

Sodium and potassium are exceptions to group 1 with being brittle in nature. Thus, another element that can form the ionic compound with the molecular formula $\rm M_2O$ is Sodium.

Sodium will form $\rm Na_2O$, which is brittle.

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