Let's complete the table step by step:
1. First Row of the Table:
- Protons = 20: The atomic number 20 corresponds to Calcium (Ca) in the periodic table.
- Neutrons = 20: This gives us the atomic mass of [tex]\( 20 + 20 = 40 \)[/tex].
- Number 20 corresponds to element Ca.
- Number 40 corresponds to the atomic mass of Calcium (Ca).
- Symbol of the element is Ca.
So, for the first row:
- [tex]\( A = \text{Ca} \)[/tex]
- [tex]\( B = 40 \)[/tex]
- [tex]\( C = \text{Ca} \)[/tex]
2. Second Row of the Table:
- Protons = 9: The atomic number 9 corresponds to Fluorine (F) in the periodic table.
- Atomic mass = 19: Since atomic mass [tex]\( = \text{number of protons} + \text{number of neutrons} \)[/tex].
- Neutrons = 19 - 9 = 10.
- Number 9 corresponds to element Fluorine (F).
- Number of electrons in a neutral atom of Fluorine (F) is equal to the number of protons, which is 9.
- Symbol of the element is F.
So, for the second row:
- [tex]\( D = 10 \)[/tex]
- [tex]\( E = 9 \)[/tex]
- [tex]\( F = \text{F} \)[/tex]
Summarizing these values:
[tex]\[
\begin{tabular}{|c|c|c|c|c|}
\hline
Protons & Neutrons & Number & Number & (symbol) \\
\hline
20 & 20 & Ca & 40 & Ca \\
\hline
9 & 10 & 9 & 19 & F \\
\hline
\end{tabular}
\][/tex]
So:
- [tex]\( A = \text{Ca} \)[/tex]
- [tex]\( B = 40 \)[/tex]
- [tex]\( C = \text{Ca} \)[/tex]
- [tex]\( D = 10 \)[/tex]
- [tex]\( E = 9 \)[/tex]
- [tex]\( F = \text{F} \)[/tex]
