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Which of the following notations represents an isotope of ${}_{25}^{54}Z$ ?

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${}_{25}^{55}Z$

${}_{24}^{54}Z$

${}_{23}^{54}Z$

${}_{26}^{55}Z$

answer is A.

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Detailed Solution

${}_{25}^{54}Z$ represents the isotope of ${}_{25}^{54}Z$ .

Isotopes are atoms of the same element having the same atomic number, but different mass numbers.

${}_{25}^{54}Z$ has atomic number 25 and mass number 54. ${}_{25}^{55}Z$ has the same atomic number 25, but a different mass number of 55.

Hence, ${}_{25}^{55}Z$ is an isotope of ${}_{25}^{54}Z$ .

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