The atoms that make up a molecule can be of the same element or different types. Diatomic molecules are a specific class of molecules that consist of two molecules of the same element. If the molecule is composed of atoms of at least two different elements, it is a chemical compound.
The cost of light rail construction varies widely, largely depending on the amount of tunneling and elevated structures required. A survey of North American light rail projects shows that costs of most LRT systems range from $15 million to over $100 million per mile.he cost of 17 miles (27 km) of highway improvements and 19 miles (31 km) of double-track light rail worked out to $19.3 million per highway lane-mile and $27.6 million per LRT track-mile. The project came in under budget and 22 months ahead of schedule.
1 Total costs depend on the type and complexity of survey. 2  A developer building new houses might have surveys done of the entire development then sell a copy of a specific parcel survey to the buyer of that lot for $300-$500. Total costs depend on the type and complexity of survey. 2  A developer building new houses might have surveys done of the entire development then sell a copy of a specific parcel survey to the buyer of that lot for $300-$500.