No, ammonium chloride in water is not a physical reaction. It is a chemical reaction. Hope this helps!
The valence electrons of an element is usually determined by its atomic number. The valence elctrons are the electrons that have the highest energy level.
Fluorine has 7 valence electrons in the ground state.
<span>Na (sodium) is highly electropositive. Its has 1 electron in its outermost orbit which is transferred to an electronegative atom to form an ionic bond.
It only needs to get rid of one valence electron to take part in a reaction. That's how it's highly reactive.</span>
Which of the following terms best describes the nucleus of a radioactive element?
C. Unstable
