Question

fluorine - 19
step 1. the atomic number of fluorine - 19 is _.
step 2. its mass number is _.
step 3. the shorthand notation for fluorine - 19 is:

step 4. is your answer reasonable? why?
_

Explanation:

Step1: Determine the atomic number

The atomic number of an element is a characteristic property. For fluorine, the atomic number is \(9\).

Step2: Identify the mass number

The notation "fluorine - 19" indicates that the mass number is \(19\).

Step3: Write the shorthand notation

The shorthand notation for an atom is \(

$$\begin{matrix}A\\Z\end{matrix}$$

X\), where \(A\) is the mass number and \(Z\) is the atomic number. For fluorine - 19 (\(X = F\), \(Z=9\), \(A = 19\)), the notation is \(

$$\begin{matrix}19\\9\end{matrix}$$

F\).

Step4: Check reasonability

The atomic number of fluorine is a well - known constant (\(Z = 9\) from the periodic table). The mass number is given as part of the isotope name ("fluorine - 19" implies \(A=19\)). The shorthand notation follows the standard \(

$$\begin{matrix}A\\Z\end{matrix}$$

X\) format.

Answer:

1. \(9\)
2. \(19\)
3. \(

$$\begin{matrix}19\\9\end{matrix}$$

F\)

1. Yes. The atomic number of fluorine (\(9\)) is from the periodic table, the mass number (\(19\)) is given by the isotope name, and the shorthand notation follows the \(

$$\begin{matrix}A\\Z\end{matrix}$$

X\) rule.