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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 electrons & Number of neutrons \\
\hline 1 & 39 & 39 & 52 \\
\hline 2 & 40 & 40 & 50 \\
\hline 3 & 39 & 39 & 54 \\
\hline 4 & 40 & 40 & 51 \\
\hline
\end{tabular}

Based on the information given, which atom in the table has the highest mass?

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



Answer :

GinnyAnswer
To determine which atom has the highest mass, we need to consider the number of protons and neutrons, as these significantly contribute to the atomic mass, while electrons have negligible mass.

Step-by-step, we will calculate the mass of each atom by summing the number of protons and neutrons for each.

1. Atom 1:
- Number of protons = 39
- Number of neutrons = 52
- Mass of Atom 1 = Number of protons + Number of neutrons
- Mass of Atom 1 = 39 + 52 = 91

2. Atom 2:
- Number of protons = 40
- Number of neutrons = 50
- Mass of Atom 2 = Number of protons + Number of neutrons
- Mass of Atom 2 = 40 + 50 = 90

3. Atom 3:
- Number of protons = 39
- Number of neutrons = 54
- Mass of Atom 3 = Number of protons + Number of neutrons
- Mass of Atom 3 = 39 + 54 = 93

4. Atom 4:
- Number of protons = 40
- Number of neutrons = 51
- Mass of Atom 4 = Number of protons + Number of neutrons
- Mass of Atom 4 = 40 + 51 = 91

After calculating the mass for each atom, we have:

- Atom 1 mass = 91
- Atom 2 mass = 90
- Atom 3 mass = 93
- Atom 4 mass = 91

By comparing the masses, we can see that Atom 3 has the highest mass.

Therefore, Atom 3 has the highest mass.

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