An isotope of iron has 28 neutrons. If the atomic mass of the isotope is 54, how many protons does it have? A. 26 B. 28 C. 54 D. 82

asked Dec 11, 2017 164k views

1 vote

An isotope of iron has 28 neutrons. If the atomic mass of the isotope is 54, how many protons does it have?

A. 26
B. 28
C. 54
D. 82

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2 votes

26 because you need to do 54-28=26
The atomic mass number is the number of protons AND neutrons together.

Ionic answered Dec 12, 2017

by Ionic

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3 votes

An isotope is a varying in the neutrons because the protons NEVERRRR change!!

54 - 28 = 26

Answer: 26

Mohsen TOA answered Dec 18, 2017

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