The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron g factor
 $g_{\rm e^-}$
 Numerical value  -2.002 319 304 360 92
 Standard uncertainty   0.000 000 000 000 36
  Relative standard uncertainty  1.8 x 10-13
 Concise form  -2.002 319 304 360 92(36)    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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