Numero atomico de :
-oro
-berilio
-nitrogeno
-fluor
-potacio
-cromo
-prabidio
-cobre
-oro
-berilio
-nitrogeno
-fluor
-potacio
-cromo
-prabidio
-cobre
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berilio- Be- n° atomico 4
nitrógeno-N -N° atomico 7
flour- F- n° atomico 9
potasio-K- n° atomico 19
cromo-Cr- n° atomico 24
Rubidio- Rb- N° atomico 37
cobre-Cu- N° Atomico 29