Structure of an Atom:
An atom is composed of three main subatomic particles: electrons, protons, and neutrons. These particles are arranged in a specific way within the atom.

Electrons:
- Electrons are negatively charged particles that orbit the nucleus of the atom in specific energy levels or shells.
- They are much smaller and lighter compared to protons and neutrons.
- Electrons determine the chemical properties of an element and are involved in chemical bonding.

Protons:
- Protons are positively charged particles located in the nucleus of the atom.
- The number of protons in an atom determines the element's atomic number.
- Protons are crucial in determining the atom's overall charge and identity.

Nucleus:
- The nucleus is the central part of the atom, composed of protons and neutrons.
- It contains most of the atom's mass and is positively charged due to the presence of protons.
- The nucleus is held together by strong nuclear forces.
In conclusion, the structure of an atom is organized with electrons orbiting the nucleus, which contains protons and neutrons. Each subatomic particle plays a crucial role in determining the atom's properties and behavior. Understanding the structure of an atom is fundamental in comprehending the nature of matter and chemical reactions.