Atomic mass of an element was 11. When a...

Atomic mass of an element was `11`. When another isotope of same element discovered, the element assigned average atomic mass of `10.8`. If percentage abundance of new isotope is `20%`, find atomic mass of new isotope.
`9`
`10`
`12`
`13`

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Atomic mass of an element was `11`. When another isotope of same element discovered, the element assigned average atomic mass of `10.8`. If percentage abundance of new isotope is `20%`, find atomic mass of new isotope.`9``10``12``13`

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Atomic mass of an element was `11`. When another isotope of same element discovered, the element assigned average atomic mass of `10.8`. If percentage abundance of new isotope is `20%`, find atomic mass of new isotope.
`9`
`10`
`12`
`13`