Express the vector R~ A B C D P R in terms of A~ , B~ , C~ , and D~ , the edges of a parallelogram. 1. R~ = C~ + D~ 2. R~ = A~ − B~ 3. R~ = A~ − C~ 4. R~ = A~ + D~ 5. R~ = B~ + D~ 6. R~ = B~ − A~ 7. R~ = A~ − D~ 8. R~ = B~ + A~ 9. R~ = D~ − A~ 10. R~ = C~ + B

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

1.state2.trash3.the earth