Question

write the isotope symbol for the following descriptions. part 1 of 2 write the isotope symbol for an element with an atomic number of 42 and 56 neutrons. part 2 of 2 write the isotope symbol for an element with an atomic number of 76 and a mass number of 192.

Explanation:

Step1: Recall isotope symbol format

The isotope symbol is written as $_{Z}^{A}X$, where $Z$ is the atomic number, $A$ is the mass - number ($A =$ number of protons+number of neutrons), and $X$ is the chemical symbol of the element.

Step2: Find element for part 1

The atomic number $Z = 42$, and the element with atomic number 42 is molybdenum (Mo). The mass number $A=42 + 56=98$. So the isotope symbol is $_{42}^{98}Mo$.

Step3: Find element for part 2

The atomic number $Z = 76$, and the element with atomic number 76 is osmium (Os). The mass number $A = 192$. So the isotope symbol is $_{76}^{192}Os$.

Answer:

Part 1: $_{42}^{98}Mo$
Part 2: $_{76}^{192}Os$