Question

AS per thomsons model, all atoms are neutal. what about alpha particls? are they neutral too?
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Answer 1

Alpha particles are not neutral. They are positively charged.

Alpha particles are fast moving He nuclei which are emitted when a radioactive atom undergoes decay. An alpha particle consists of 2 protons and 2 neutrons. Because it has no electron cloud, it has an overall charge of +2. It is denoted by the symbol α and is written ₂ ⁴He²⁺ or He²⁺ as there are no electrons.