It could be a liquid, solid, or gas! Liquid being water, Solid being wood, gas being oxygen. Some examples.<span />
The difference is that in a nuclear reactor it uses normal pressures and temperatures that are relative to earth using fission , where as in the sun, fusion happens and with that comes extremely high temperatures and bone squishing pressures.
Answer:
This is the answer
Explanation: It's right here
For sodium, it has 1 valence electron
For oxygen, it has 6 valence electrons
For iron, it has 2 valence electrons
Just look it up you’ll get the answers faster