Question

An atom of an element contains $17$ protons, $18$ neutrons and $17$ electrons. Which of the following will be the atomic structure of another isotope of this element?

• A. $17$ protons, $20$ neutrons, $17$ electrons
• B. $17$ protons, $18$ neutrons, $16$ electrons
• C. $18$ protons, $18$ neutrons, $17$ electrons
• D. $20$ protons, $18$ neutrons, $17$ electrons

Answer 1

Answer: (A)

$17$ protons, $20$ neutrons, $17$ electrons

The isotopes have same number of protons and electrons and different number of neutrons. So the correct option of isotope of given element is option A.