An ion of iron has an 26 protons, 30 neutrons, and 23 electrons. what are its atomic number, atomic mass, and net charge?
a. atomic number = 26, atomic mass = 56, net charge = 3+
b. atomic number = 26, atomic mass = 56, net charge = 3-
c. atomic number = 30, atomic mass = 56, net charge = 3+
d. atomic number = 56, atomic mass = 26, net charge = 3-

Which is the best predictor of the radioactive nature of an isotope? o the proton-to-electron ratio the neutron-to-proton ratio o the neutron-to-electron ratio the electron-to-proton ratio

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Aparticle of mass m is placed in a one-dimensional box of length l. the box is so small that the particle’s motion is relativistic, so that e p2/2m is not valid. (a) derive an expression for the energy levels of the particle using the relativistic energy–momentum relation and the quantization of momentum that derives from connement. (b) if the particle is an electron in a box of length l 1.00 1012 m, nd its lowest possible kinetic energy. by what percent is the nonrelativistic formula for the energy in error?