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Mass of an atom of element X is equivalent to the total mass of 7H atoms. Give the name and symbol of the element represented by X

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Mass of an atom of element X is equivalent to the total mass of 7H atoms. Give the name and symbol o...

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Mass of an atom of element X is equivalent to the total mass of 7H atoms. Give the name and symbol of the element represented by X ​

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Mass of an atom of element X is equivalent to the total mass of 7H atoms. Give the name and symbol of the element represented by X