Question

$M^{2+}$ ion is isoelectronic of $S{O}_2$ and has $(Z+2)$ neutrons ( $Z$ is atomic number of $M$ ) Thus, ionic mass of $M^{2+}$ is

• A. 70
• B. 66
• C. 68
• D. 64

Answer 1

Answer: (A)

$M^{2+}$ has electrons $=32($ isoelectronic of $S{O}_2$ ) protons $=34=Z$
neutrons $=36$
thus, ionic mass $=70$