To determine which element has the greatest atomic mass, we'll follow these steps:
1. Recall that the atomic mass of an element is the sum of the number of protons and the number of neutrons in its nucleus.
2. Use the given values to compute the atomic mass for each element by adding the number of protons and neutrons.
Let's begin the calculations for each element:
- Bohrium (Bh):
- Number of protons: 107
- Number of neutrons: 155
- Atomic mass = 107 + 155 = 262
- Uranium (U):
- Number of protons: 92
- Number of neutrons: 146
- Atomic mass = 92 + 146 = 238
- Francium (Fr):
- Number of protons: 87
- Number of neutrons: 136
- Atomic mass = 87 + 136 = 223
- Seaborgium (Sg):
- Number of protons: 106
- Number of neutrons: 157
- Atomic mass = 106 + 157 = 263
Now that we have computed the atomic masses:
- Bohrium: 262
- Uranium: 238
- Francium: 223
- Seaborgium: 263
Among these, the greatest atomic mass is 263, which corresponds to Seaborgium.
Therefore, the element with the greatest atomic mass is:
Seaborgium at 263
