Relative mass of particles
Protons and neutrons weigh the same, whereas electrons weigh very little (almost nothing)
![Protons weigh 1.0073 amus which is a tiny tiny fraction of a gram](/images/user/base/Chemistry/2. Atomic Structure/2.2.6-proton-weight-image-(new).bc0e8d3.jpg)
![Neutrons weigh 1.0083 amus which is heavier but the difference is too small to measure so they weigh the same](/images/user/base/Chemistry/2. Atomic Structure/2.2.7-neutrons-weight-image-new-.d36cfa1.jpg)
Neutrons (newts) weigh the same as protons (peas), so also have a mass of one.
![An electron weighs 0.00054 of an amu which is mega small because of this the electron is ignored when calculating the mass of an atom](/images/user/base/Chemistry/2. Atomic Structure/2.2.8-electron-weight-image-new.a5f1de9.jpg)
The illustration above applies to all protons, neutrons and electrons regardless of the element.
Protons and neutrons again
![Protons and neutrons weigh the same](/images/user/base/Chemistry/2. Atomic Structure/electron-proton-neutron.8038c66.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-1.4df6ee6.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-2.d516bb3.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-1.b0b0513.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-2.f89189d.jpg)