Answer:
[tex]its \: - 30 \\ because \: mass \: of \: electron = 9 \times {10}^{ - 31} \\ 9can \: be \:round \: in \: to \: 10so \: 10 \times {10}^{ - 31} \\ = {10}^{ - 30} \\ then \: order \: = - 30 \\ thank \: you[/tex]
