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.
Costs vary significantly for each conversion. However, there are two main costs of a conversion project. One is the cost of all work within your property line, such as gas piping, equipment, and chimney-liner costs, which would be your responsibility.he other cost, typically referred to the capital construction cost, is the cost for Con Edison to provide and install gas facilities up to your building s property line. Con Edison will provide cost estimates in your service determination based on information you provide in your gas service request.