Mass number minus the atomic number equals the number of neutrons. Mass number is the number of particles in an atom that have significant mass. Electrons are assigned a valâ¦ue of 0 since the mass is so much smaller than protons and neutrons. Protons and neutrons are similar in mass and are assigned mass number of 1.
Why Uber is losing so much money? The biggest part of the problem is that Uber is a relative small fish in the market and is not getting nearly enough customers. According to analyst reports, as of August 2015, Didi Kuaidi completed seven million rides as opposed to Uber's one million.
According to the latest valuation by the Wall Street Journal, Uberâs worth has now risen to $51 billion, securing its spot as the most valuable start-up in the world. Xiaomi follows in a close second with $46 billion, and Airbnb with $25 billion. Below youâll find a chart of the 10 most valuable start-ups in the world.