Http://www.chem4kids.com/files/elem_pertable.html this should help.
<u>Answer:</u> The correct answer is Option 2.
<u>Explanation:</u>
Radioactive substances are unstable in nature and tend to get stable by some nuclear reactions.
Nuclear reaction are the reactions which changes the nucleus of an atom. There are two nuclear reactions: Nuclear fission and Nuclear fusion.
These two processes can make a radioactive sample can convert it into a non-radioactive sample.
Nuclear fission reactions: In these reactions a larger nuclei (parent nuclei) splits into two or more stable daughter nuclei.
Nuclear fusion reactions: When two or more smaller nuclei combine to form one larger nuclei, these reactions takes place.
In the question, it is asked the characteristic of a non-radioactive daughter isotope after it is formed from a parent isotope. The parent isotope is undergoing nuclear fission reaction and is forming a stable nucleus.
Hence, the correct answer is Option 2.
<span>0.50 mg x ( 1 mL / 0.25 mg ) = 2 mL </span>
Answer: 241. 8g. Add the mass of Fe, 3 N masses (because of the 3 outside the parenthesis), and add the 9 O because of the 3 next to it and the 3 outside. This results to 55.846+42.0201+143.946g that equals 241.8g. I hope this helps
170 Im pretty sure. It bounces off at the same angle as it is striked