Answer:
this is fairly simple if you have a periodic table with you.
Explanation:
atomic number 17 is Cl mass numer is 35.45 for protons neutron and electron you can just look that up on google. atomic number is where it is at on the periodic table and the mass number is in the little square at the bottom.
Answer:
An element
Explanation:
Elements are not able to be separated, but everything else can, whether that be physically or chemically.
Accuracy is when you hit as close as to the target as you can and precision is when you are on point
