The mass of an electron is 9.11 x 10-31 kg. If you want to increase the speed of the electron from 90% of the speed of light to 95% of the speed of light (where the
speed of light is 2.997x108 m/s), the amount of work that must be done is:
8.2 x 10-13)
0 3.2× 10-13 ,
O 2.6% 10-13 ,
O 7.4× 10-14 ,
3.8 x 10-15)

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answerdmitry mendeleyev made a workable classification of the elements