# Number of protons, neutrons and electrons in the element ₈₉X²³¹ is: A) 89, 231, 89 B) 89, 89, 242 C) 89, 142, 89 D) 89, 71, 89

2
by Barbie123

2015-04-16T11:56:44+05:30

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Atomic No. Z = 89
Atomic Mass No. A= 231
Number of electrons= 89
Number of Protons= 89
Number of Neutrons = A-Z= 231-89= 142
So, the answer is 3) 89, 142, 89
2015-04-16T12:01:22+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Atomic number is 89
so, proton = 89
electron = 89
for neutron N = 231-89 = 142
ans is C