🔬 Part 1: Atomic Theory Knowledge

☐ J.J. Thomson (discovered the electron)

☐ Democritus (proposed atoms exist)

☐ John Dalton (created atomic theory)

☐ Ernest Rutherford (discovered the nucleus)

📝 Part 2: Timeline Analysis

a) Democritus lived in ancient _____________ around 460 BC.

b) John Dalton proposed that atoms of the same element are _____________ and have the same mass.

c) J.J. Thomson discovered tiny negatively charged particles called _____________.

d) Ernest Rutherford found that atoms have a dense centre called the _____________.

🎯 Part 3: Scientific Thinking