Compared with ³¹P, the radioactive isotope ³²P has
A) a different atomic number.
B) one more proton.
C) one more electron.
D) one more neutron.

Question

Quizplus · Accepted Answer

Isotopes of an element have the same atomic number (i.e. number of protons). Therefore, option A and B are incorrect. Isotopes differ in their number of neutrons. Since ³¹P and ³²P differ only in their number of neutrons, the correct answer is D. Option C (one more electron) is also incorrect as isotopes have the same number of electrons.

Compared with ³¹P, the Radioactive Isotope ³²P Has