Question

The model of the atom has changed over time in light of new knowledge and discoveries. Which option correctly describes one such change?

A- In 420 B.C., John Dalton developed the idea that small atoms combined to form molecules

B-About 1900, Neils Bohr developed an atomic model where positively charged particles orbit a negatively charged nucleus

C-About 1900, J.J Thomson discovered electrons were negatively charged particles.

D- About 1915, J.J Thomson developed an atomic model where negatively charged particles orbit a positively charged nucleus.

Answer 1

None of the options are correct.

Answer 2

"Option A is the correct answer.

As this option describes that the atom model has changed over period of time with new knowledges and discoveries. It is because "Neils Bohr" developed an "atomic model" where "positively charged particles" orbit a "negatively charged nucleus" in 1912. On the other hand, J.J Thomson discovered electrons were "negatively charged particles" in 1897. In 1904, J.J Thomson developed an "atomic model" where "negatively charged particles" orbit a "positively charged nucleus"."