Question

part of the periodic table is shown. using the information from the chart what is the number of neutrons for gold? (* think subtraction) au 79 197

Explanation:

Step1: Recall neutron calculation formula

The number of neutrons in an atom is calculated by subtracting the atomic number (number of protons) from the mass number (sum of protons and neutrons). The formula is: $\text{Number of neutrons} = \text{Mass number} - \text{Atomic number}$.

Step2: Identify values for gold

From the periodic table information given, gold (Au) has an atomic number of 79 (the number 79) and a mass number of 197 (the number 197).

Step3: Perform the subtraction

Substitute the values into the formula: $197 - 79 = 118$.

Answer:

118