The conventional current model describes a ___ charge moving from the positive to the negative terminal of a battery, and the electron current model describes current as the drift of ___ charges that flow from the negative to the positive terminal.

What structural formula represents 4 electrons shared between two atoms?

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states

How do you know how many valence electrons an atom has?