The correct statement about an atom is:
A. The electron has a negative charge and is found outside of the nucleus.
Here's a breakdown of the other statements:
- B. The proton has no charge and is found in the nucleus. (Incorrect - protons have a positive charge.)
- C. The neutron has a negative charge and is found in the nucleus. (Incorrect - neutrons have no charge.)
- D. The neutron has no charge and is found outside of the nucleus. (Incorrect - neutrons have no charge, but they are found in the nucleus.)
So, option A is the only correct statement.