Atom

An atom is the smallest unit retaining the chemical properties of an element. It consists of a central nucleus with protons and neutrons, surrounded by electrons. Atoms of the same element have the same number of protons.

What is the definition of an atom?

Describe the structure of an atom.

What particles are found in the nucleus of an atom?

How do atoms of the same element differ from those of different elements?

What is the significance of the number of protons in an atom?