Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus. Alpha particles are positively charged particles which carry 4 units mass and +2 units charge. These are same as the helium nuclei and are emitted from the radioactive substances like uranium, thorium etc.
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What are the fundamental particles present in a neutral atom having atomic number greater than 1?
Neutron + electron + proton.
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Why were neutrons discovered very late?
The neutrons were discovered very late as they are chargeless.
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