If an element has 4 protons and 5 neutrons its mass number is

Which of the following describes a situation where competition between producers exists

How many moles of bromine are needed to produce 3.23 moles of potassium bromide

Substance a is a nonpolar liquid and has only dispersion forces among its constituent particles. substance b is also a nonpolar liquid and has about the same magnitude of dispersion forces among its constituent particles. when substance a and b are combined, they spontaneously mix.