Ionic Compound : It forms when metal reacts with non metal.
Magnesium is metal and Iodine is non metal. Mg have tendency to form Mg 2+ ion and I have tendency to form I - ion. Magnesium and Iodine reacts and forms ionic compound ( MgI 2 ).
Potassium is metal and oxygen is non metal. K have tendency to form K + ion and O have tendency to form O 2- ion. Potassium and oxygen reacts and forms ionic compound ( K2O ).
Covalent compound : It forms when two non metals react.
Oxygen and Fluorine are two non metals.
They form covalent compound OF2
Sr and K are both metals , they do not form ionic compound.
ANSWER :
element #1 | element # 2 | Forms ionic compound | empirical formula of compound |
magnesium | Iodine | Yes | MgI2 |
Strontium | potassium | No | |
Fluorine | Oxygen | No | |
Potassium | Oxygen | Yes | K2O |
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