Anything you can tell about what you are observing which you then take and make into a hypothesis
The earliest arrowheads were made of stone and of organic materials. As human cibilation progressed other materials were used.
Answer:
2 neutrons
Explanation:
3-1=2
protons and neutrons equal the atomic mass...
the atomic number is the number of protons so take the mass- the protons and you get the neutrons
I'm not sure.... but Manuel scalpels?