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Thompson saw that there must be a source of positive energy in the atom to make the negative charge on the electrons. This led Thomson to know that atoms could be described as negative particles moving within a diffuse positive charge. Thomson knew that atoms are neutral in electric charge so he asked a question, how can atoms contain negative particles and still be neutral. He hypothesized that the rest of the atom must be positively charged in order to cancel out the negative charge of the electrons. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons.

User Vins
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Answer:

Thompson discovered that atoms have both positive and negative charges. He found that electrons, which are negatively charged particles, exist within a positively charged area in the atom. This balance of charges makes atoms neutral overall. Thompson's experiments with cathode ray tubes showed that all atoms have these tiny negatively charged particles called electrons.

User Aravind Reddy
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