You didn't put the reactions
Answer:
1. c. group 15
2. a. group 1
3. c. m
Explanation:
1. and 2. you just have to know the charge rules.
3. m = mass number = total protons and neutrons
- Hope that helped! Please let me know if you need further explanation.
15.0 g/342.2965= .0438 mol
Answer:
Option D.
Explanation:
Some of the alpha particles Rutherford shot at the gold foil bounced back, some scattered; but the majority of them went right through. That meant there had to be some sort of positively charged subatomic particle in there that pulled them through, but it had to be at the center and couldn't take up a lot of room.