Let's complete the table step by step to describe each atom accurately using the periodic table.
### First Atom:
1. Number of Protons: 20
2. Number of Neutrons: 20
3. Atomic Number (A): The atomic number is the number of protons in an element, so A = 20.
4. Mass Number (B): The mass number is the sum of the number of protons and neutrons. Therefore, B = 20 (protons) + 20 (neutrons) = 40.
5. Element (symbol) (C): The element with an atomic number of 20 is Calcium, denoted by the symbol Ca.
So, for the first atom:
[tex]\[ A = 20, \ B = 40, \ C = \text{Ca} \][/tex]
### Second Atom:
1. Number of Protons: 9
2. Number of Neutrons (D): The mass number is the sum of the number of protons and neutrons. Given the mass number is 19, we find the number of neutrons by:
[tex]\[ \text{Number of neutrons} = \text{Mass number} - \text{Number of protons} \][/tex]
[tex]\[ D = 19 - 9 = 10 \][/tex]
3. Atomic Number (E): The atomic number is the number of protons, so E = 9.
4. Mass Number: 19 (provided in the table).
5. Element (symbol) (F): The element with an atomic number of 9 is Fluorine, denoted by the symbol F.
So, for the second atom:
[tex]\[ D = 10, \ E = 9, \ F = \text{F} \][/tex]
Thus, the completed table is:
[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]
To summarize:
A = 20 \
B = 40 \
C = Ca \
D = 10 \
E = 9 \
F = F
