What do scientists do when they run experiments? 1. write down their observations
2. walk away from the experiment
3. change parts of the experiment
4. develop a hypothesis

I will mark brainleist, only if you get the answer correct, scam answers will be reported.

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic

It would be true sodium reacts with water in a violent way 

Answerchemical;