Question

1. From which experiments was it discovered that atoms have an
internal structure? When?
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Answer 1

Answer:

J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."

Answer 2

Answer:

from J.J thomsons experiment in 1887