Which atomic model describes negative particles embedded in a positively charged substance?

Which atomic model describes negative particles embedded in a positively charged substance?

• A. Nuclear model
• B. Plum pudding model
• C. Electron cloud model
• D. Solar system model

Answer: (B)

The main idea is that early atomic thinking described a positively charged substance with negative pieces scattered throughout. This is the plum pudding model, where electrons are embedded inside a blob of positive charge, so the atom remains overall neutral. That direct fit—negative particles embedded in a positively charged substance—makes it the best description for this statement. The other models describe charge differently: a dense nucleus with electrons around it, a spread-out electron cloud around a central nucleus, or electrons orbiting like planets around the nucleus. This helps you see why Thomson’s image matched the description before later experiments refined the picture.

The main idea is that early atomic thinking described a positively charged substance with negative pieces scattered throughout. This is the plum pudding model, where electrons are embedded inside a blob of positive charge, so the atom remains overall neutral. That direct fit—negative particles embedded in a positively charged substance—makes it the best description for this statement. The other models describe charge differently: a dense nucleus with electrons around it, a spread-out electron cloud around a central nucleus, or electrons orbiting like planets around the nucleus. This helps you see why Thomson’s image matched the description before later experiments refined the picture.