1. Which atomic model suggested that electrons orbit the nucleus in fixed energy levels?

• Dalton's model

• Bohr's model

• Rutherford's model

• Plum pudding model

1. What did Rutherford's gold foil experiment conclude about the structure of an atom?

• Atoms are made up of positive and negative charges evenly distributed throughout their volume.

• The nucleus is a dense, positively charged center of an atom.

•  Electrons are located in specific energy levels around the nucleus.

• The atom is a solid, indivisible particle.

1. Which atomic model proposed that electrons exist in electron clouds or regions of probability?

• Thomson model

• Dalton model

• Rutherford model

• Quantum mechanical model

1. Who proposed the idea that electrons have wave-like properties and can exist in specific energy levels?

• Erwin Schrödinger

• J.J. Thomson

• Niels Bohr

• John Dalton

1. According to the modern atomic model, which subatomic particle is located outside the nucleus?

• Neutron

• Proton

• Electron

• Nucleus