Answer: An alpha-particle is identical to the nucleus of a normal (atomic mass four) helium atom i.e. a doubly ionised helium atom. Alpha particles (also termed alpha radiation or alpha rays) was the first nuclear radiation to be discovered, beta particles and gamma rays were identified soon after.
I had the same question last week and my answer was C. Try that.
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I'll take a gander at your question
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If you mean the Earth's crust, your answer is The Mantle.
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The atoms are separating, and sublimation is happening.
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