The isotope fluorine-18, $$${ }_{9}^{18} \mathrm{~F}$$$, undergoes $$$\beta^{+}$$$decay to form a stable isotope. How many neutrons are there in a nucleus of the stable isotope?

Physics

IGCSE&ALevel

CAIE

Exam No：9702_w24_qp_11 Year：2024 Question No：39

Answer:

11.1.1 infer from the results of the α-particle scattering experiment the radiation existence and small size of the nucleus

11.1.2 describe a simple model for the nuclear atom to include protons, neutrons and orbital electrons

11.1.3 distinguish between nucleon number and proton number

11.1.4 understand that an element can exist in various isotopic forms, each with a different number of neutrons

11.1.5 use the usual notation for the representation of nuclides

11.1.6 appreciate that nucleon number, proton number, and mass-energy are all conserved in nuclear processes

11.1.7 show an understanding of the nature and properties of α-, β- and γ-radiations (both β– and β+ are included)

11.1.8 state that (electron) antineutrinos and (electron) neutrinos are produced during β– and β+ decay