Question

using the isotopic notation shown below and the periodic table, identify the unknown element. 86? this isotope has 50 neutrons. isotopic name symbol

Explanation:

Step1: Recall mass - number formula

The mass - number (A) is given as 86. The mass - number is the sum of protons (Z) and neutrons (N), i.e., $A = Z+N$.

Step2: Calculate number of protons

We know $A = 86$ and $N = 50$. Using the formula $Z=A - N$, we substitute the values: $Z=86 - 50=36$.

Step3: Identify element

The atomic number (number of protons) determines the element. Looking at the periodic table, the element with atomic number 36 is Krypton.

Answer:

Isotopic Name: Krypton - 86
Symbol: $^{86}_{36}Kr$