To complete the table and describe each atom, let's determine the missing values step by step:
### First Row:
- Number of Protons: 20
- Number of Neutrons: 20
- Atomic Number (A): The atomic number is the number of protons, which is 20.
- Mass Number (B): The mass number is the sum of the number of protons and neutrons. So, [tex]\( B = 20 (protons) + 20 (neutrons) = 40 \)[/tex].
- Element (C): The element with the atomic number 20 is Calcium, with the symbol "Ca".
### Second Row:
- Number of Protons: 9
- Number of Neutrons (D): The number of neutrons can be found by subtracting the number of protons from the mass number. [tex]\( D = 19 (mass number) - 9 (protons) = 10 \)[/tex].
- Atomic Number (E): The atomic number is the number of protons, which is 9.
- Element (F): The element with the atomic number 9 is Fluorine, with the symbol "F".
Thus, the table is completed as follows:
[tex]\[
\begin{tabular}{|c|c|c|c|c|}
\hline \begin{tabular}{c}
Number of \\
Protons
\end{tabular} & \begin{tabular}{c}
Number of \\
Neutrons
\end{tabular} & \begin{tabular}{c}
Atomic \\
Number
\end{tabular} & \begin{tabular}{c}
Mass \\
Number
\end{tabular} & \begin{tabular}{c}
Element \\
(symbol)
\end{tabular} \\
\hline 20 & 20 & 20 & 40 & Ca \\
\hline 9 & 10 & 9 & 19 & F \\
\hline
\end{tabular}
\][/tex]
Answers:
A = 20
B = 40
C = Ca
D = 10
E = 9
F = F
