Question

The species that contains 24 protons, 26 neutrons and 22 electrons would be represented by the symbol:

• A. ${}^{50}{V}^{3+}$
• B. ${}^{26}C{r}^{2+}$
• C. ${}^{50}C{r}^{2+}$
• D. ${}^{26}M{n}^{2+}$

Answer 1

The correct option is C ${}^{50}C{r}^{2+}$

An element can be represented as: ${}_Z^A{X}^{n\pm }$
Where, A is mass number of the element
Z is the atomic number
$n\pm$ is the charge associated with the element
and X is the symbol of element.
From the given values,
Number of protons =$24$
Hence, atomic number is $24$ means that the element is chromium. Symbol =Cr
Number of electrons =22
Hence, charge on element =$24-22=+2$
Mass number =$numberofproton+numberofneutron=24+26=50$
Hence, ${}^{50}C{r}^{2+}$, option (c) is corect.