Applying Math
6. Simple Equation An atom of niobium has a mass
number of 93. How many neutrons are in the nucleus
of this atom? An atom of phosphorus has 15 protons
and 15 neutrons in the nucleus. What is the mass
number of this isotope?
SECTION 2 The Simplest Matter 283

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

the answer is c i took the test

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