What is the mass defect of lithium-7? Assume the following:
Atomic number of lithium = 3
Atomic mass of lithium = 7.016003 atomic mass units.
Mass of 1 proton = 1.007276 atomic mass units.
Mass of 1 neutron = 1.008665 atomic mass units.

Question

What is the mass defect of lithium-7? Assume the following:
Atomic number of lithium = 3
Atomic mass of lithium = 7.016003 atomic mass units. 
Mass of 1 proton = 1.007276 atomic mass units. 
Mass of 1 neutron = 1.008665 atomic mass units.

umm · Answer

Welcome to QuestionCove.
Any ideas/guesses?

sillybilly123 · Answer

${Li}$: p = 3, n = 4

$\Delta m =  3 \times  1.007276   +  4 \times 1.008665 -  7.016003  = 0.040485  $