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  4. M2+ ion is isoelectronic of SO 2 and has ( Z +2) neutrons ( Z is atomic number of M ) Thus, ionic mass of M2+ is

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

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Solution:

$M ^{2+}$ has electrons $=32\left(\right.$ isoelectronic of $SO _2$ ) protons $=34=Z$
neutrons $=36$
thus, ionic mass $=70$