Question

K forms the compound K 2 O , which is an ionic compound that is brittle. Identify another element, M , that is likely to form a brittle, ionic compound with the formula M 2 O . Justify your answer in terms of periodic trends.

Answer 1

The other element is sodium Na

Explanation:

• The oxidation state of potassium is +1
• The group that shows oxidation state of +1 is the group No. 1
• Group 1 has metal elements
• Na and K have same number of valence electrons and thus shows same oxidation state.
• Na and K both belong to group 1 and are brittle in nature
• One can easily cut them into pieces
• The compound that has a chemical formula M2O is also brittle so the other element is Na