Question

match the following scientists with their contribution to the atom structure theory:
dalton choose
democritus choose
jj thomson choose
ernest rutherford choose
james chadwick choose

Explanation:

• Dalton: Proposed the atomic theory, stating that matter is composed of indivisible atoms, atoms of the same element are identical, and atoms combine in fixed ratios to form compounds.
• Democritus: Coined the term "atom" (from the Greek "atomos" meaning indivisible) and proposed that matter is made of tiny, indivisible particles.
• JJ Thomson: Discovered the electron through cathode ray experiments and proposed the plum - pudding model of the atom, where electrons are embedded in a positively charged "soup".
• Ernest Rutherford: Conducted the gold - foil experiment, which led to the discovery of the atomic nucleus. He proposed the nuclear model of the atom, with a small, dense, positively charged nucleus at the center and electrons orbiting around it.
• James Chadwick: Discovered the neutron, which is a sub - atomic particle with no charge, present in the nucleus along with protons.

Answer:

• Dalton: Proposed atomic theory (atoms are indivisible, same element atoms are identical, combine in fixed ratios).
• Democritus: Coined "atom", proposed matter is made of tiny, indivisible particles.
• JJ Thomson: Discovered electron, proposed plum - pudding model.
• Ernest Rutherford: Discovered atomic nucleus, proposed nuclear model (gold - foil experiment).
• James Chadwick: Discovered neutron.