The description of the mass differences between the states of the

baryon octet with spin parity $(\frac{1}{2})^+$ and decuplet

$(\frac{3}{2})^+$ in terms of the chromomagnetic interaction

is extended to the mesons $0^-$ and $1^-$, to the

two lowest scalar tetraquarks and to the recently discovered

hidden charm pentaquarks discovered at LHCb with the result

to predict four states $(\frac{3}{2})^-$ with "open channel"

p $J/psi$ and $\Lambda_c \bar{D}^{*0}$ for the two lightest ones

and $\Sigma_c \bar{D}^*$ for the two heaviest ones.