Question 23M.2.HL.TZ2.26a

${}_{27}{}^{60}\mathrm{Co} \to {}_{28}{}^{60}\mathrm{Ni} + {}_{-1}{}^0\mathrm{\beta }$ ✓

Accept “e/e-/β for beta particle.

Penalize incorrect Z even if elemental symbol is correct.
Penalize incorrectly placed A and Z on nuclear symbol.

Do not penalize missing Z on nuclear symbol.