Two stable isotopes of lithium `"_3^6Li` and `"_3^7 Li`have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium.

The three stable isotopes of neon: "_10^20 Ne , "_10^21Ne and "_10^22Ne have respective abundances of 90.51%, 0.27% and 9.22%. The atomic masses of the three isotopes are 19.99 u, 20.99 u and 21.99 u,respectively. Obtain the average atomic mass of neon.

The relative abundance of various isotopes of silicon is as:Si-28=92.23%,Si-29=4.67% and Si-30=3.10%. Calculate the average atomic mass of silicon.

Boron has two stable isotopes, "_5^10B and "_5^11B . Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of "_5^10B and "_5^11B .

Boron has two stable isotopes "_5^10B and "_5^11B . There respective masses are 10.01294 u and 11.00931 u and the atomic mass of boron is 10.811 u. Find the abundances of "_5^10B and "_5^11B .

The binding energy per nucleon of _2He^4 is 7.075 MeV. If the masses of prton and neutron are 1.007270 a.m.u. and 1.008665 a.m.u. respectively,find the mass of _2He^4 nucleus.

The centroid of a triangle ABC is at the point (1,1,1). If the coordinates of A and B are (3,-5,7) and (-1,7,-6) respectively, find the coordinats of the point C.

The vector having initial and terminal points as (2,5,0) and (-3,7,4) respectively is

Nitrogen occurs in nature in the form of two isotopes with atomic mass 14 and 15 respectively. If average atomic mass of nitrogen is 14.0067, what is the % abundance of the two isotopes ?