Match the following. 1. isotopes
2. determine unique element
3. negligible mass
4. protons
5. arranged by atomic number
6. neutrons and protons
7. variation in atomic weight
8. forms lighter elements
9. forms heavier elements

A) Periodic Table
B) isotope
C) protons
D) fusion
E) atomic weight
F) atomic number
G) fission
H) electrons
I) neutrons

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.