Which of the following species has
(a) equal numbers of neutrons and electrons;
(b) protons, neutrons, and electrons in the ratio 9:11:8;
(c) a number of neutrons equal to the number of protons plus one-half the number of electrons?
24Mg2+, 47Cr, 60Co3+, 35Cl-, 124Sn2+, 2266Th, 90Sr Petrucci, Ralph H.. General Chemistry (p. 63). Pearson Education. Kindle Edition.