Understanding Atomic Structure

In the early 19th century, scientists began to understand atomic structure, recognizing that atoms consist of a nucleus with protons and electrons arranged outside. However, they struggled to explain the stability of hydrogen atoms, as a stationary electron would fall into the nucleus due to attraction, and an orbiting electron would radiate energy and spiral inward. This highlighted the need for a stable atomic model.

During which century did scientists begin to understand the structure of atoms?

• 19th century

• 20th century

• 18th century

• 17th century

What particles are found in the nucleus of an atom?

• Protons

• Photons

• Electrons

• Neutrons

Why can't electrons be stationary in an atom?

• They would lose energy

• They would repel each other

• They would fall into the nucleus

• They would become neutral

What is required for an electron to maintain a circular orbit around the nucleus?

• Constant mass

• Constant acceleration

• Constant charge

• Constant speed

What happens to charged particles when they accelerate?

• They emit sound

• They lose mass

• They gain energy

• They emit light

What would happen to an electron in a circular orbit if it radiates light?

• It would stop moving

• It would spiral into the nucleus

• It would gain energy

• It would become neutral