An atom with 39 protons and a mass number of 89 what is the number of neutrons

Why Rutherford model sometimes called the nuclear model

Describe your observations of the original solutions. Describe your observations when the silver nitrate was added to the sodium chloride solution.

How do you work out the charges of compounds?

The vitamin A molecule has the formula C20H30O, and a molecule of vitamin A2 has the formula C20H28O. Deter - mine how many moles of vitamin A2 contain the same number of atoms as 1.000 mol vitamin A.

The rate of filtration is Select one: a. modified by boundary layer effects. b. increased with increasing viscosity of the fluid being filtered. c. decreased with increasing viscosity of the fluid being filtered. d.

The ductility of a material is the measure of a) The amount of elastic deformation that can be sustained before yielding b) The capacity of a material to absorb energy when it is deformed elastically c) The degree of plastic deformation that has

Consider the polymerization of styrene in toluene at 60°C initiated by di-t-butylperoxide for a solution containing 0.04 mol of initiator and 2 mol of monomer per liter. The initial rates of initiation, Ri, and propagation, RP, are found to be 1.

Which of the dollowing isotopes have 8 neutrons in the nucleus? 0-15 0-17 C13 O C14

Click the DeltaH is an Extensive Property button within the activity, and analyze the relationship between the two reactions that are displayed.

The fundamental unit used to measure mass is?