Question

What is the mass defect of lithium? assume the following: atomic number of lithium = 3 atomic mass of lithium = 7.0144 atomic mass units. mass of 1 proton = 1.0073 atomic mass units. mass of 1 neutron = 1.0087 atomic mass units.

(a)0.0043 atomic mass units
(b)0.0423 atomic mass units
(c)3.0219 atomic mass units
(d)4.0348 atomic mass units
(e)7.0567 atomic mass units

Answer 1

B. 0.0423 atomic mass units

Step-by-step explanation:

Mass Defect = (Sum of the Masses of Protons + Neutrons) - Atomic Mass

= (3proton*1.0073amu/proton

+ 4neutron*1.0087amu/neutron)

- 7.0144 amu

= 0.0423 amu