Which of the following is ALWAYS the same for different isotopes of a single element?
A) atomic number
B) atomic mass number
C) tendency to decay radioactively
D) half-life

Question

Quizplus · Accepted Answer

Atomic number is the number of protons in the nucleus of an atom and is what determines the element's identity. Isotopes of an element have the same number of protons, therefore the atomic number remains constant. B, C, and D may vary among isotopes.

Which of the Following Is ALWAYS the Same for Different