Column I Column IIacharge on electron (magnitude)p1.6022×10−19Cbe/meq1.758820×1011Ckg−1cMass of proton, mpr1.00867udMass of neutron, mns1.00727u t4.8×10−10esu

The charge on electron (magnitude),

$e = 1.6022 \times 10^{- 19} C$ or,

$e = 4.8 \times 10^{- 10} esu$

The ratio of charge on an electron to its mass,

$1.758820 \times 10^{11} {Ckg}^{- 1}$

Mass of proton,

$m_{p} = 1 . 00727 u$

Mass of neutron,

$m_{n}$ $= 1 .00867 u$

Column I Column II
a charge on electron (magnitude) p $1.6022 \times 10^{- 19} C$
b $e / m_{e}$ q $1.758820 \times 10^{11} {Ckg}^{- 1}$
c Mass of proton, $m_{p}$ r $1 .00867 u$
d Mass of neutron, $m_{n}$ s $1 .00727 u$
t $4.8 \times 10^{- 10} esu$