Question

WHAT DOES IT MEAN THAT "ELECTRIC CHARGES ARE QUANTIZED" OR THEY CAN BE STORED IN DISCRETE PACKETS ?WHAT ARE DISCRETE PACKETS?

Answer 1

Charge quantization, then, means thatcharge cannot take any arbitrary values, but only values that are integral multiples of the fundamental charge(charge of proton/electron). For example, in a hydrogen ion, we usually denote it with a positive sign to indicate that there's one proton more than there are electrons.
Discrete packet is
Quantum. ... For example, a photon is a single quantum of light (or of any other form of electromagnetic radiation), and can be referred to as a "light quantum". Similarly, the energy of an electron bound within an atom is also quantized, and thus can only exist in certain discrete values.