# The mass of a proton is 1.00728 amu and that of a neutron is 1.00867 amu. What is the mass defect ( in amu) of a nickel-60 nucleus? The mass of a nickel-60 nucleus is 59.9308 amu

Feb 19, 2017

The mass defect of an $\text{Ni-60}$ nucleus is 0.5505 u.

#### Explanation:

The mass defect is the difference between the mass of a nucleus and the total mass of its constituent particles.

A nucleus of $\text{_28^60"Ni}$ has 28 protons and 32 neutrons.

$\text{Mass of 28 protons" color(white)(ll)= "28 × 1.00728 u" = "28.20384 u}$

$\text{Mass of 32 neutrons" = "32 × 1.00867 u" = "32.27744 u}$

$\text{Mass of (p + n)"color(white)(mml) =color(white)(mmmmmmmmll) "60.48128 u}$

$\text{Mass of"color(white)(l) ""_28^60"Ni"color(white)(l) "nucleus" = color(white)(mmmmmmmmll)"59.9308 u}$

$\text{Mass defect" color(white)(mmmml)=color(white)(mmmmmmmmml) "0.5505 u}$