The proton mass is 1.007276 amu , the neutron mass is 1.008665 amu , and the electron mass is 5.486×10−4 amu. Required:
a. What is the expected mass of a sodium-23 nucleus, based on the total mass of its protons and neutrons?
b. What is the binding energy for a sodium-23 nucleus?
c. What is the binding energy, ΔE, for a sodium-23 nucleus in MeV/nucleon?

Is this a scientific model? use complete sentences to explain why or why not. a graphic organizer showing the water cycle

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

In 2002, the rare earth elements mine in mountain pass, california was closed because