Which of the following is the correct atomic symbol for an element that has 30 neutrons and a mass number of 55?
A) At
B) Zn
C) Co
D) Mn
E) Cs

Name: Which of the following is the correct atomic symbol for an element that has 30 neutrons and a mass number of 55? A) At B) Zn C) Co D) Mn E) Cs
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Question

Quizplus · Accepted Answer

The mass number is the sum of protons and neutrons. For an element with 30 neutrons and a mass number of 55, it must have 25 protons (55 - 30 = 25). The element with 25 protons is Manganese (Mn).

Which of the Following Is the Correct Atomic Symbol for an Element