Question

Which of the following elements you need to remove to form an isotone family?

• A. ${}_8{O}^{16}$
• B. ${}_7{N}^{15}$
• C. ${}_6{C}^{14}$
• D. ${}_{13}A{l}^{27}$
• E. ${}_9{F}^{17}$

Answer 1

Answer: (D)

Two or more nuclides are iso tones, if they have the same neutron number. Hence,
(a) ${}_8{O}^{16}=8$ protons $+8$ neutrons
(b) ${}_7{N}^{15}=7$ protons $+8$ neutrons
(c) ${}_6{C}^{14}=6$ protons $+8$ neutrons
(d) ${}_{13}A{l}^{27}=13$ protons $+14$ neutrons
(e) ${}_9{F}^{17}=9$ protons $+8$ neutrons