* Atomic Number: This defines the element the atom belongs to and determines the number of protons in the nucleus.

* Atomic Mass: This represents the average mass of an atom of that element, taking into account the different isotopes. It is primarily determined by the number of protons and neutrons in the nucleus.

* Electrons: The number of electrons orbiting the nucleus is equal to the number of protons, ensuring a neutral charge for the atom.

* Electronegativity: This value indicates an atom's tendency to attract electrons in a chemical bond.

* Valence Electrons: These are the electrons in the outermost energy level of an atom, which are involved in chemical bonding.

* Electron Configuration: This describes the arrangement of electrons in different energy levels and sublevels within an atom.

In addition to these fundamental properties, each type of atom in a molecule also contributes to:

* The molecule's overall shape: The arrangement of atoms in a molecule is determined by the bonds between them, which in turn are influenced by the properties of the individual atoms.

* The molecule's polarity: The electronegativity difference between the atoms in a molecule can lead to the formation of polar bonds, creating a net dipole moment for the entire molecule.

* The molecule's chemical reactivity: The number of valence electrons and electronegativity of the atoms determine how readily a molecule will participate in chemical reactions.

It's important to note that while atoms have these inherent properties, their behavior within a molecule is influenced by their interactions with the other atoms present. The properties of the individual atoms are combined to create the unique characteristics of the molecule as a whole.