Answer the following questions about the element Si and some of its compounds. (a) The mass spectrum of a pure sample of Si is

Question

Answer the following questions about the element Si and some of its compounds.
(a) The mass spectrum of a pure sample of Si is shown below.
(i) How many protons and how many neutrons are in the nucleus of an atom of the most abundant isotope of Si?
(ii) Write the ground-state electron configuration of Si.
Two compounds that contain Si are SiO2 and SiH4.
(b) At 161 K, SiH4 boils but SiO₂ remains as a solid. Using principles of interparticle forces, explain the difference in boiling points.

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