(a) Mass of 6Li3, lithium isotope, m 1 = 6.01512 u
Mass of 7Li3, lithium isotope, m = 7.01600 u
Abundance of 6Li3 , η1 = 7.5%
Abundance of 7Li3 , η2 = 92.5%
The atomic mass of lithium atom is given as:
( b ) Mass of boron isotope 10B5 , m = 10.01294 u
Mass of boron isotope 11B5 , m = 11.00931 u
Abundance of 10B5, η1 = x %
Abundance of 11B5, η2 = (100 − x ) %
Atomic mass of boron, m = 10.811 u The atomic mass of boron atom is given as:
And 100 − x = 80.11%
Hence, the abundance of is 10B5 19.89% and that of 11B5 is 80.11%.
Atomic mass of 20Ne10, m1 = 19.99 u
Abundance of 20Ne10, η1 = 90.51%
Atomic mass of 21Ne10, m2 = 20.99 u
Abundance of 21Ne10, η2 = 0.27%
Atomic mass of 22Ne10, m3 = 21.99 u
Abundance of 22Ne10, η3 = 9.22%
The average atomic mass of neon is given as:
