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Atoms are the basic building blocks of ordinary matter. ... Atoms are composed of particles called protons, electrons and neutrons. Protons carry a positive electrical charge, electrons carry a negative electrical charge and neutrons carry no electrical charge at all.

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an atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.

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A basic unit of a matter is atom, which contains all the properties of the matter, it is nutral as far as charges are concern. 

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Atoms are the basic units of matter.An atom  is made up of three subatomic particles: protons, neutrons, and electrons. The protons and  neutrons forms the center of the atom called  nucleus and the electrons are revolving around them.The electrons are negatively charged and  protons are positively charged and neutron has no charge. In an atom the number of protons and the number of electrons are equal to make it electrically neutral.

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