How can we say that an atom
in an elemant is positievely
charged or negatively
An atom is neither positively charged nor negatively charged. It is neutral since it contains equal number of protons (positive charge) and electrons (negative charge).
How can we say that the reactivity of an element is high or the reactivity of an element is low????
Who proposed charge and how we can say charge is positive or negative or neutral and what theorem are used ? Why and give reason?
How can we say that charge acquired by glass rod is positive while for ebonite rod it is negative?