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De vigtigste elementarpartikler<br />

Navn Symbol Masse<br />

(u)<br />

Masse (kg) Ladning<br />

Neutron n 1.008665 1.6749 × 10 -27 0<br />

Proton p 1.007276 1.6726 × 10 -27 +1<br />

Elektron e – 0.000549 9.1091 × 10 -31 –1<br />

Positron e + 0.000549 9.1091 × 10 -31 +1<br />

Neutrino 0 0 0<br />

Foton 0 0 0<br />

1 u (atommasseenhed) = 1.664 ×10 -27 kg<br />

2013 Isotopteknik F02 (JG) 7

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