Explanation:

Number of Electrons and Chemical Properties:
- The number of electrons in an atom determines its chemical properties.
- Electrons play a crucial role in the bonding behavior of atoms, which in turn determines how atoms interact with each other to form compounds.
- The arrangement of electrons in an atom's electron shells influences its reactivity and ability to form bonds with other atoms.
- For example, atoms with a full outer electron shell (such as noble gases) tend to be stable and unreactive, while atoms with incomplete outer shells are more likely to form bonds in order to achieve a stable electron configuration.

Effect on Reactivity:
- The number of electrons in an atom's outer shell determines its reactivity.
- Atoms with fewer electrons in their outer shell tend to lose, gain, or share electrons to achieve a stable electron configuration, resulting in the formation of chemical bonds.
- The reactivity of an atom is also influenced by factors such as electronegativity, electron affinity, and ionization energy, which are all related to the number and arrangement of electrons in the atom.

Conclusion:
In conclusion, the chemical properties of an atom are indeed dependent on the number of electrons in that atom. The arrangement of electrons in an atom's electron shells influences its reactivity, bonding behavior, and overall chemical properties. Understanding the role of electrons in atoms is essential in predicting how different elements will interact with each other to form compounds.