16-09-2021
Chemistry

contestada

An isotope of an element has a mass number of 129 and it has 74 neutrons. How many
protons does it have?
A) 203
B) 55
C) 129
D) 74

Respuesta :

vallejosmalespinafac vallejosmalespinafac

16-09-2021

Answer:

Explanation:

tiene 74 protones

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