Ionic Bonding

Which statement best defines ionic bonding?

Which observation provides the most direct evidence that electrons in an ionic compound belong to discrete ions rather than being shared?

A student lists the following ions in order of decreasing ionic radius: N³⁻ > O²⁻ > F⁻ > Na⁺ > Mg²⁺ > Al³⁺. What is the correct justification?

Which cation has the greatest polarising power?

Solid sodium chloride does not conduct electricity, but molten sodium chloride does. Which explanation is correct?

Magnesium oxide has a much higher melting point than sodium chloride. Which factor is the primary reason?

Which dot-and-cross representation correctly shows the ions formed in magnesium oxide?

In aluminium chloride, AlCl₃ shows significant covalent character despite being formed from a metal and a non-metal. Which combination of factors best explains this?

Which ion has the largest ionic radius?

Which anion is the most polarisable?

In the giant ionic lattice of sodium chloride, what is the coordination number of each Na⁺ ion?

A student claims: “When two ionic compounds have the same cation, the one with the more polarisable anion will show greater covalent character.” Which experimental observation best supports this claim?

Which half-equation correctly represents the formation of the oxide ion from an oxygen atom?

A teacher places a green spot of copper(II) chromate(VI) at the centre of a moist filter paper connected to a d.c. power supply. After current flows, a blue band appears near the negative electrode and a yellow band near the positive electrode. What does this observation demonstrate?