To determine which atom has the highest mass based on the given table, let's follow these steps:
### Step 1: Identify the relevant information.
The table provides the number of protons, electrons, and neutrons for four atoms. The atoms have the following respective counts:
| Atom | Number of protons | Number of electrons | Number of neutrons |
|------|-------------------|---------------------|--------------------|
| 1 | 39 | 39 | 52 |
| 2 | 40 | 40 | 50 |
| 3 | 39 | 39 | 54 |
| 4 | 40 | 40 | 51 |
### Step 2: Calculate the atomic mass for each atom.
The atomic mass is approximately the sum of the number of protons and neutrons, since the mass of electrons is negligible in comparison.
For each atom:
- Atom 1: [tex]\( 39 \, \text{(protons)} + 52 \, \text{(neutrons)} = 91 \)[/tex]
- Atom 2: [tex]\( 40 \, \text{(protons)} + 50 \, \text{(neutrons)} = 90 \)[/tex]
- Atom 3: [tex]\( 39 \, \text{(protons)} + 54 \, \text{(neutrons)} = 93 \)[/tex]
- Atom 4: [tex]\( 40 \, \text{(protons)} + 51 \, \text{(neutrons)} = 91 \)[/tex]
### Step 3: Compare the calculated masses.
List the atomic masses for clarity:
- Atom 1: 91
- Atom 2: 90
- Atom 3: 93
- Atom 4: 91
### Step 4: Identify the atom with the highest mass.
- The highest mass among these is 93.
- Atom 3 has this mass.
### Conclusion:
Atom 3 has the highest mass.
Therefore, the atom in the table that has the highest mass is: 3.
