Complete the following sentences:

The charge of the proton is ______ coulomb.

• The charge of proton is $\mathbf{1}\mathbf{.}\mathbf{6}\mathbf{\times }{\mathbf{10}}^{\mathbf{-}\mathbf{19}}$ coulomb.
• Proton was discoverd by Eugene Goldstein. Proton is positively charged and the relative charge of the proton is +1.
• The absolute mass of proton is $\mathbf{1}\mathbf{.}\mathbf{6}\mathbf{\times }{\mathbf{10}}^{\mathbf{-}\mathbf{27}}\mathbf{}\mathbf{Kg}$ and relative mass of proton is 1.