Chemistry, 31.01.2020 18:47, hsjsjsjdjjd

2) el plomo (pb) tiene de número atómico (z) 82 y de número másico (a) 207. las partículas del
átomo neutro son:
a. número de protones
b. número de electrones
c. número de neutrones

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2) el plomo (pb) tiene de número atómico (z) 82 y de número másico (a) 207. las partículas del
...