Answer:
24.5872 meters per second
Rouned 24.6 or 25
The HONC 1234 rule is a way to remember the bonding tendencies of hydrogen, oxygen, nitrogen, and carbon atoms in molecules. Hydrogen tends to form one bond, oxygen two, nitrogen three and carbon four.
After 3 years, the substance will go through 4 half lives. You can do 230*(1/2)^4, which is 14.375.
Protons are positive
Neutrons are neutral
Electrons are negatively charged
I think the answer is a but I am not for sure
