Answered

\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|}
\hline
& Element & Symbol & \begin{tabular}{c}
Atomic \\
Number
\end{tabular} & \begin{tabular}{c}
\# of \\
Protons
\end{tabular} & \begin{tabular{c}
\# of \\
Electrons
\end{tabular} & \begin{tabular{c}
Atomic \\
Mass
\end{tabular} & \begin{tabular{c}
Rounded \\
Atomic \\
Mass
\end{tabular} & \begin{tabular{c}
\# of \\
Neutrons \\
(Show \\
Work)
\end{tabular} & Period \\
\hline
1) & Oxygen & O & 8 & 8 & 8 & 15.999 & 16 & [tex]$16-8=8$[/tex] & 2 \\
\hline
2) & Helium & He & 2 & 2 & 2 & 4.0026 & 4 & [tex]$4-2=2$[/tex] & 1 \\
\hline
3) & Carbon & C & 6 & 6 & 6 & 12.011 & 12 & [tex]$12-6=6$[/tex] & 2 \\
\hline
4) & Aluminum & Al & 13 & 13 & 13 & 26.982 & 27 & [tex]$27-13=14$[/tex] & 3 \\
\hline
5) & Calcium & Ca & 20 & 20 & 20 & 40.078 & 40 & [tex]$40-20=20$[/tex] & 4 \\
\hline
\end{tabular}

\begin{tabular}{|c|c|c|c|c|c|c|c|c|}
\hline
6) & Sodium & Na & 11 & 11 & 11 & 22.990 & 23 & [tex]$23-11=12$[/tex] & 3 \\
\hline
7) & Potassium & K & 19 & 19 & 19 & 39.098 & 39 & [tex]$39-19=20$[/tex] & 4 \\
\hline
\end{tabular}



Answer :

GinnyAnswer
Let's fill out the given table step-by-step using the known properties of the elements that we have.

### 1) Oxygen
- Element: Oxygen
- Symbol: O
- Atomic Number: 8
- Number of Protons: 8
- Number of Electrons: 8
- Atomic Mass: 15.999
- Rounded Atomic Mass: 16
- Number of Neutrons: [tex]\(16 - 8 = 8\)[/tex]
- Period: 2

### 2) Helium
- Element: Helium
- Symbol: He
- Atomic Number: 2
- Number of Protons: 2
- Number of Electrons: 2
- Atomic Mass: 4.0026
- Rounded Atomic Mass: 4
- Number of Neutrons: [tex]\(4 - 2 = 2\)[/tex]
- Period: 1

### 3) Carbon
- Element: Carbon
- Symbol: C
- Atomic Number: 6
- Number of Protons: 6
- Number of Electrons: 6
- Atomic Mass: 12.011
- Rounded Atomic Mass: 12
- Number of Neutrons: [tex]\(12 - 6 = 6\)[/tex]
- Period: 2

### 4) Aluminum
- Element: Aluminum
- Symbol: Al
- Atomic Number: 13
- Number of Protons: 13
- Number of Electrons: 13
- Atomic Mass: 26.981
- Rounded Atomic Mass: 27
- Number of Neutrons: [tex]\(27 - 13 = 14\)[/tex]
- Period: 3

### 5) Calcium
- Element: Calcium
- Symbol: Ca
- Atomic Number: 20
- Number of Protons: 20
- Number of Electrons: 20
- Atomic Mass: 40.078
- Rounded Atomic Mass: 40
- Number of Neutrons: [tex]\(40 - 20 = 20\)[/tex]
- Period: 4

### 6) Sodium
- Element: Sodium
- Symbol: Na
- Atomic Number: 11
- Number of Protons: 11
- Number of Electrons: 11
- Atomic Mass: 22.99
- Rounded Atomic Mass: 23
- Number of Neutrons: [tex]\(23 - 11 = 12\)[/tex]
- Period: 3

### 7) Potassium
- Element: Potassium
- Symbol: K
- Atomic Number: 19
- Number of Protons: 19
- Number of Electrons: 19
- Atomic Mass: 39.098
- Rounded Atomic Mass: 39
- Number of Neutrons: [tex]\(39 - 19 = 20\)[/tex]
- Period: 4

Here is the completed table based on the provided information:

[tex]\[ \begin{array}{|c|c|c|c|c|c|c|c|c|c|} \hline & \text{Element} & \text{Symbol} & \text{Atomic Number} & \#\text{ of Protons} & \#\text{ of Electrons} & \text{Atomic Mass} & \text{Rounded Atomic Mass} & \#\text{ of Neutrons (Show Work)} & \text{Period} \\ \hline 1) & \text{Oxygen} & \text{O} & 8 & 8 & 8 & 15.999 & 16 & 16-8=8 & 2 \\ \hline 2) & \text{Helium} & \text{He} & 2 & 2 & 2 & 4.0026 & 4 & 4-2=2 & 1 \\ \hline 3) & \text{Carbon} & \text{C} & 6 & 6 & 6 & 12.011 & 12 & 12-6=6 & 2 \\ \hline 4) & \text{Aluminum} & \text{Al} & 13 & 13 & 13 & 26.981 & 27 & 27-13=14 & 3 \\ \hline 5) & \text{Calcium} & \text{Ca} & 20 & 20 & 20 & 40.078 & 40 & 40-20=20 & 4 \\ \hline 6) & \text{Sodium} & \text{Na} & 11 & 11 & 11 & 22.99 & 23 & 23-11=12 & 3 \\ \hline 7) & \text{Potassium} & \text{K} & 19 & 19 & 19 & 39.098 & 39 & 39-19=20 & 4 \\ \hline \end{array} \][/tex]