Paper 2 · Subatomic particles, ions and bonding
Chlorine-35, ³⁵Cl, has atomic (proton) number 17. State the number of neutrons in one atom of chlorine-35.
Model answer
18
Also accepted: 18 neutrons
Explanation: Number of neutrons = mass number − proton number = 35 − 17 = 18.
Derived from ZIMSEC Chemistry 5071/2 Paper 2 Theory, November 2014, Q1
