I believe it should be A. Increased reaction rate due to the increased number of collisions between particles.
D. to preserve the union. He changed the meaning of the war when he passed the Emancipation Proclamation in 1863.
Hope this helps. Please let me know if I'm wrong :)
Answer:
The 3 rd answer
Explanation:
Atomic number is the number of protons in the nucleus of that element...
Mass number is the the sum of protons and neutrons in the nucleus of the atom..