-Ionic bonds lose or gain electrons usually between a non-metal and a metal,
-Covalent bonds share electrons usually between two non-metals
Answer: Atoms contain tiny, negatively charged electrons
Explanation: Thomson's experiments with cathode ray tubes helped him to discover the electron (which Dalton did not know about). Dalton thought that atoms were indivisible particles, and Thomson's discovery of the electron proved the existence of subatomic particles.
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