There are two isotopes of an element with atomic mass z. Heavier on has atomic mass z+2 and lighter one has z-1, then abundance of lighter one is

There are two isotopes of an element with atomic mass z. Heavier one has atomic mass z+2 and lighter one has z-1, then abundance of lighter one is

Boron has two isotopes with atomic masses 10 and 11. If its average atomic mass is 10.81, the abundance of lighter isotope is________.

An elements of atomic mass "m" consists of two isotopes of mass numbers (m-1) and (m+2). The percentage abundance of lighter isotope is

" Two isotopes of an element (atomic mass "=x+2.35" ) have mass "(x+2)" and "(x+7)" respectively.Calculate natural abundance of heavier isotope in percentage."

In each of the following question, an Assertion (A) is following by a corresponding Reason (R ). Use the following keys to choose the appropriate answer. Assertion : Average atomic mass of an element depends upon the atomic masses of different isotopes and their fractional abundances. Reason : Average atomic mass is obtained by multiplying the atomic mass of the heavier isotope with its fractional abundances.

Boron has two isotopes, B-10 and B-11. The average atomic mass of boron is found to be 10.80u. Calculate the percentage of abundance of these isotopes.