The charges and sizes of the ions in an ionic compound affect the strength of the electrostatic interaction between the ions and thus the strength of the lattice energy of the ionic compound. Arrange the compounds according to the magnitudes of their lattice energies based on the relative ion charges and sizes.

The options in the question are:

MgCl2, MgS, KBr, NaCl

Explanation:

Lattice energy depends the relative sizes and charges of the ions present in the lattice.

According to this model, ionic compounds with lower lattice energy tend to be more soluble in water. Recall that this consideration of ion size and magnitude of charge only refer to the strength of electrostatic interaction in an ionic bond or lattice energy of an ionic compound.

Based on the options listed, the order of decreasing lattice energy is:

MgS>MgCl2> NaCl>KBr

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.