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Each element has a unique atomic spectrum. If a gas is placed in a tube and then an...

X-RAY => “It is an electromagnetic wave with a short wave“. X-RAY PROPERTIES – Not visible to the...

1. Atomic Number and Mass Number The element is a single substance that can not be broken down...

Dalton’s atomic theory was based on two laws, namely the law of conservation of mass (Lavoisier law) “The...

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