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A role of the unstable nuclei ${}^{6}$Be, ${}^{8}$Be and ${}^{9}$B in thedissociation of relativistic nuclei ${}^{7,9}$Be, ${}^{10}$B and ${}^{10,11}$Cis under study on the basis of nuclear track emulsion exposed to secondarybeams of the JINR Nuclotron. Contribution of the configuration ${}^{6}$Be +$\mit{n}$ to the ${}^{7}$Be nucleus structure is 8 $\pm$ 1% which is near thevalue for the configuration ${}^{6}$Li + $\mit{p}$. Distributions over theopening angle of $\alpha$-particle pairs indicate to a simultaneous presence ofvirtual ${}^{8}$Be$_{g.s.}$ and ${}^{8}$Be$_{2^+}$ states in the ground statesof the ${}^{9}$Be and ${}^{10}$C nuclei. The core ${}^{9}$B is manifested inthe {${}^{10}$C} nucleus with a probability of 30 $\pm$ 4%. Selection of the${}^{10}$C "white" stars accompanied by ${}^{8}$Be$_{g.s.}$ (${}^{9}$B) leadsto appearance in the excitation energy distribution of 2$\alpha$2$\mit{p}$"quartets" of the distinct peak with a maximum at 4.1 $\pm$ 0.3 MeV.${}^{8}$Be$_{g.s.}$ decays are presented in 24 $\pm$ 7% of 2He + 2H events ofthe ${}^{11}$C coherent dissociation and 27 $\pm$ 11% of the 3He ones. Thechannel ${}^{9}$B + H amounts 14 $\pm$ 3%. The ${}^{8}$Be$_{g.s.}$ nucleus ismanifested in the coherent dissociation ${}^{10}$B $\to$ 2He + H with aprobability of 25 $\pm$ 5% including 14 $\pm$ 3% of ${}^{9}$B decays. Aprobability ratio of the mirror channels ${}^{9}$B + $\mit{n}$ and ${}^{9}$Be +$\mit{p}$ is estimated to be 6 $\pm$ 1.

Unstable nuclei in dissociation of light stable and radioactive nuclei in nuclear track emulsion