Thomas Edison worked very hard through many experiments to develop successful inventions. He conducted over 100 experiments to create a working light bulb with the right combination of metals and gases. He also did around 10,000 experiments to develop a battery that could effectively provide electric current.

1. Memorize me

2. there is no substitute for hard
work.
It took about 100 different
“experiments” before he
found a successful
combination of metals and
gases to make the light
bulb.
He also conducted about
10,000 different
experiments to develop an
actual battery that worked
well for providing electrical
current.

3. there is no substitute for hard
work.

4. FIRST COLUMN
All +1

5. 2nd COLUMN
All +2

6. Column 7
the halogens
All -1

7. sulfide
S -2

8. sulfate
SO4 -2

9. sulfite
SO3 -2

10. nitrate
NO3 -1

11. Fe
+2 OR +3
Ferrous or Ferric

12. Cu
+1 or +2
Cuprous or cupric

13. iron
+2 OR +3
Ferrous or Ferric

14. copper
+2 OR +1
cupric or cuprous

15. nitrate
NO3 -1

16. sulfate
SO4 -2

17. acetate
C2H3O2 -1

18. hydroxide
OH -1

19. phosphate
PO4 -3

20. carbonate
CO3 -2

21. Hydrogen
carbonate
HCO3 -1

22. bicarbonate
HCO3 -1

23. ammonium
NH4 +1

24. aluminum
Al +3

25. Fe
+2 OR +3
Ferrous or Ferric

26. zinc
+2 Zn

27. Fe
+2 OR +3
Ferrous or Ferric

28. Group 1
All +1

29. Group 2
+2

30. halogens
-1

31. ammonium
NH4 +1

32. bicarbonate
HCO3 -1

33. Tin
Stannous OR Tin +2
Stannic or Tin +4

34. Lead
Plumbous or lead +2
Plumbic or lead +4

35. Chromium
chromous or chromium +2
chromic or chromium +3