Answer:
D. The electrons are outside the nucleus and have a negative charge.
Step-by-step explanation:
Electrons are located outside the nucleus while protons and neutrons are located inside the nucleus.
Electrons are negatively charged and attracted to nucleus as the nucleus carry protons that are positively charged and neutrons have no charge.
Electrons are arranged in different energy levels based on the attraction between the positively charged nucleus and negatively charged electron.
Hence, the correct answer is "D. The electrons are outside the nucleus and have a negative charge."