The three elements were written in the order of increasing atomic mass

1.	The three elements were written in the order of increasing atomic mass the atomic mass of middle element was roughly the average of the atomic mass of the two elements , this stated by
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The three elements were written in the order of increasing atomic mass the atomic mass of middle element was roughly the average of the atomic mass of the two elements , this stated by

Answer»

you are a NEW USER here ☺️