ATOM

Atom is the smallest unit of an element or matter . It has unique characteristics of a chemical properties ...
It consist of solid, liquid, gas, and plasma which are neutralized or ionized atoms
It can not be seen with naked eyes except with the use of a microscope. It has three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and protons..THEY ARE BOTH CALLED NUCLEONS ..Protons carry a positive electrical charge, electrons carry a negative ... it has some properties
Which are?
Mass range
1.67×10−27 to 4.52×10−25 kg
Electric charge
zero (neutral), or ion charge
Diameter range
62 pm (He) to 520 pm (Cs) (data page)
It has more than 99.94% of an atom's mass in the nucleus... if the number of electron and the protons are equal it is electrically neutral..