Question

(c.6a) three models of atomic theory are illustrated in the image. place them in chronological order. a b c options: c, b, a; b, a, c; a, b, c; c, a, b

Explanation:

1. Identify each model:

• Model C: Thomson's "plum - pudding" model (electrons in a positive "soup"), earliest (late 19th century).
• Model A: Rutherford's nuclear model (nucleus with electrons around, early 20th century, after Thomson).
• Model B: Bohr's planetary model (electrons in orbits around nucleus, after Rutherford).

1. Chronological order: Thomson (C) → Rutherford (A) → Bohr (B).

Answer:

D. C, A, B (assuming the last option is D. C, A, B as per the options given with the last one being "C. A, B" which might be a typo, but the correct order is C (Thomson), A (Rutherford), B (Bohr))