If an isotope of an element has 27 neutrons and a mass number of 52 ,how many electrons must it have?
A)25
B)27
C)52
D)79
E)none of the above

Name: If an isotope of an element has 27 neutrons and a mass number of 52 ,how many electrons must it have? A)25 B)27 C)52 D)79 E)none of the above
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Question

Quizplus · Accepted Answer

The number of electrons in a neutral atom equals the number of protons. The mass number (52) is the sum of protons and neutrons. With 27 neutrons, there are 25 protons, so there must be 25 electrons.

If an Isotope of an Element Has 27 Neutrons and a Mass