Predict properties of compounds from a knowledge of the bonding type. 1. A porti

Question

Predict properties of compounds from a knowledge of the bonding type. 1. A portion of a two-dimensional "slab" of NaCI(s) is shown here (see figure below) in which the ions are numbered. (a) Of the following types of interactions (identified by colour), predict which are (b) Consider the "green-green" interactions between ions 1 and 3, ions 1 and 5, and (c) Consider the "green-green interactions between ions 1 and 5 and the "green (d) Predict the thermal stability of NaCI(s) using your answer to part (c) to help attractive and which are repulsive: purple-purple, purple-green, "green-green Explain. ions 3 and 5. Predict which of these three will result in the interaction of largest magnitude. Predict which will result in the interaction of the smallest magnitude. purple" interactions between ions 1 and 2. Predict which of these will have the greater magnitude. explain the basis of your prediction 2. (a) Compare the electronic structures of atomic chromium and atomic selenium. In what respects are they similar, and in what respects do they differ? (b) Chromium is a metal, and selenium is a non-metal. What factors are important in determining this difference in properties?

Explanation / Answer

a

Same color represent same atoms, which means same charge. So same color interactions will be repulsive.

Green - Green , Purple-purple interactions are repulsive

Similarly Green - purple interactions will be attractive.

b.

Ineraction of 1-5 ,3-5 will be of same amount because they pair is equidistant in both cases

1-3 interaction will be smaller than 1-5 , 3-5 because of larger distance between 1-3

c.

Green purple interaction is stronger than greeen - green interaction because of larger distance between green green i.e 1-5 ions.

d. Since freen purple interaction is stronger han greeen - green interaction, this means attractive han greeen - green interaction is stronger than repulsive han greeen - green interaction. This imparts thermal stability to the NaCl molecule.

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