You will have been prescribed silver sulfadiazine<span> cream to prevent, or to treat, a bacterial skin infection.</span><span> It works by killing the germs (bacteria) responsible for skin infections. </span>
Visit this page and read the Radium series part
https://en.wikipedia.org/wiki/Uranium-238
Answer: It is important to conduct multiple trials so one can get the best results, additionally, multiple trials with result in minimal errors. Finally it is important to conduct multiple trials because it will show you the actual answer/solution/whatever. If you do something once their may of been a random unknown affect and you would of never knew because you only conducted the experiement once.
Explanation:
The theory of infinite universe and the theory of vacuum as a substance. First was disproved by the discovery of the big bang and the later by some experiments with light which have shown that vacuum is not a substance but empty space.
To find the number of neutrons.....
NEUTRONS = MASS NUMBER - ATOMIC NUMBER ( PROTONS)
NEUTRONS = 19 - 9
So this element has 10 neutrons