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The table below gives the numbers of protons, electrons, and neutrons in four atoms.

\begin{tabular}{|l|l|l|l|}
\hline
Atom & Number of protons & Number of neutrons & Number of electrons \\
\hline
1 & 9 & 8 & 9 \\
\hline
2 & 9 & 9 & 8 \\
\hline
3 & 9 & 9 & 10 \\
\hline
4 & 9 & 10 & 9 \\
\hline
\end{tabular}

Based on the table, which atom has a charge of -1?

A. 1
B. 2
C. 3
D. 4



Answer :

GinnyAnswer
To determine which atom has a charge of -1, we'll need to understand the concept of atomic charge. The charge of an atom is calculated by subtracting the number of protons from the number of electrons:

[tex]\[ \text{Charge} = \text{Number of electrons} - \text{Number of protons} \][/tex]

Let's calculate the charge for each atom given in the table:

- Atom 1:
[tex]\[ \text{Protons} = 9, \text{Electrons} = 9 \][/tex]
[tex]\[ \text{Charge} = 9 - 9 = 0 \][/tex]

- Atom 2:
[tex]\[ \text{Protons} = 9, \text{Electrons} = 8 \][/tex]
[tex]\[ \text{Charge} = 8 - 9 = -1 \][/tex]

- Atom 3:
[tex]\[ \text{Protons} = 9, \text{Electrons} = 10 \][/tex]
[tex]\[ \text{Charge} = 10 - 9 = 1 \][/tex]

- Atom 4:
[tex]\[ \text{Protons} = 9, \text{Electrons} = 9 \][/tex]
[tex]\[ \text{Charge} = 9 - 9 = 0 \][/tex]

From the calculations above, we see that Atom 2 has a charge of -1. Therefore, the atom with a charge of -1 is:

2

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