Isotypes

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They have same number of ATOMIC NUMBER but a drifferent atomic mass.

ATOMIC mass is weighted average mass of an tom of an element based on the revelative natural abudance of that isotopes

Mass number is a count of the toatal number of protons in an atom's neturon.

Cl 17 top right 35.5 bottom left

Cauculating relative atomic mass from Isotope abudance

A=mass1*abudance1+mass2*abudance 2+.../100