## Chemistry and Chemical Reactivity (9th Edition)

a) $m_s=\pm1/2$, thus it can't be zero. b)$-\ell\leq m_\ell\leq \ell$ and in this case$-1\leq m_\ell\leq 1,4$ so it is invalid. c) $0\leq\ell\leq n-1$, in this case $0\leq\ell\leq 2$