As the solar nebula contracts, it A) cools due to ...

[codyclark]

As the solar nebula contracts, it
 
  A) cools due to condensation.
  B) reverses its direction of rotation.
  C) loses angular momentum.
  D) spins faster due to conservation of angular momentum.
  E) flattens out into the ecliptic plane around the Sun's poles.

Question 2

An isotope of fluorine has 9 protons and 10 neutrons. What are the atomic number and atomic mass number of this fluorine? If we added a proton to this fluorine nucleus, would the result still be fluorine? What if we added a neutron instead? Explain.
 
  What will be an ideal response?

[recede]

Answer to Question 1

D

Answer to Question 2

The atomic number of fluorine is equal to the number of protons, 9. The atomic mass number is equal to the number of protons plus neutrons, 19. If we added a proton, it would no longer be fluorine. If we added a neutron instead, it would just be another isotope of fluorine, with atomic number 9 but atomic weight 20.