What is the number of valence electrons that is considered as stable

What happens when you slowly pulled the carboard?

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of energy.