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The relative ISOTOPIC mass is the mass of an element in relation to Carbon-12. The reason that this is the ISOTOPIC mass, is because some elements have different isotopic forms, for example Chlorine...
Beta radiation is the one in the middle and because it's the one in the middle between alpha and gamma it's a bit odd. It's not as big as alpha and not as ionising as alpha....
A nuclear reactor works by splitting up large atoms such as uranium. This is known as nuclear fission. These large atoms are very unstable and can be split up by firing a neutron at them. They split...

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When a nucleus is very big it becomes unstable. It's a bit like when you build a sandcastle and when you get a really big sandcastle the last bit of sand just keeps falling off. That last bit...

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You have likely produced ammonia in the laboratory from the thermal decomposition of ammonium chloride, or from the reaction of ammonium and hydroxide ions. Have you ever wondered how ammonia is...