In the modern atomic model it could be best said that electrons are usually
a. moving in defined orbits.
b. locked into distinct shells.
c. constantly moving between shells.
d. moving in a unpredictable patterns within their shell.

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.