I think it's letter:
B.Coefficients are placed in front of the reactants and/or products
a) Number of protons = number of electron in the atom = atomic number
So it has 7 protons answer
N-3 has gained 3 electron so number of electrons + 7+3
= 10 answer
Will be destroyed unless helped.
I think it can change the paperclip's color.
A physical change is a change in the appearance of a substance.
