The CaKr is compound which is likely to form because its charge will be balanced.
What is compound?
A chemical compound is referred to as a substance made up of several similar molecules linked together with chemical bonds and containing atoms from multiple elements. A molecule made up of only one element's atoms is hence not a compound.
What is charge?
It gains charge when electrons are transferred between each other. When the count of protons is higher than the count of electrons, the charge is positive.
Ca has 1 charge and Kr has also 1 charge. hence, CaKr will form as a compound. The charge of [tex]Na_{2}S, BaCl_{3}[/tex] and MgF is not balanced that's why they can not form compound.
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