Your answer is partially correct. Multiple-Concept Example 3 provides some pertinent background for this problem. Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occurring electrons is removed. The radius of the orbit is 3.08 x 10-1 m. Determine the magnitude of the electron's centripetal acceleration. Number i ! Units m/s^2Your answer is partially correct. Multiple-Concept Example 3 illustrates several of the concepts used in this problem. A single electron orbits a lithium nucleus that contains three protons (+3e). The radius of the orbit is 2.95 x 10-17 m. Determine the kinetic energy of the electron. K Number Units k and Media