Question
Which statement correctly compares the valence electrons for atoms of francium and barium?
barium has more valence electrons, and they are in a higher energy level
francium has fewer valence electrons, but they are in a higher energy level
francium has more valence electrons, and they are in a higher energy level
barium has fewer valence electrons, but they are in a higher energy level
barium has more valence electrons, and they are in a higher energy level
francium has fewer valence electrons, but they are in a higher energy level
francium has more valence electrons, and they are in a higher energy level
barium has fewer valence electrons, but they are in a higher energy level
Answers
GPT-4o mini
To compare the valence electrons for francium (Fr) and barium (Ba), we need to look at their positions on the periodic table.
- Barium (Ba) is in Group 2 and has 2 valence electrons.
- Francium (Fr) is in Group 1 and has 1 valence electron.
In terms of energy levels, francium is in the 7th period and barium is in the 6th period. Therefore, the valence electrons of francium are in a higher energy level compared to those of barium.
Now, let's analyze the statements:
1. **Barium has more valence electrons, and they are in a higher energy level.** - Incorrect, as barium has more valence electrons but they are in a lower energy level.
2. **Francium has fewer valence electrons, but they are in a higher energy level.** - Correct, as francium has 1 valence electron in a higher energy level than barium.
3. **Francium has more valence electrons, and they are in a higher energy level.** - Incorrect, as francium has fewer valence electrons.
4. **Barium has fewer valence electrons, but they are in a higher energy level.** - Incorrect, as barium has more valence electrons.
The correct statement is: **Francium has fewer valence electrons, but they are in a higher energy level.**
- Barium (Ba) is in Group 2 and has 2 valence electrons.
- Francium (Fr) is in Group 1 and has 1 valence electron.
In terms of energy levels, francium is in the 7th period and barium is in the 6th period. Therefore, the valence electrons of francium are in a higher energy level compared to those of barium.
Now, let's analyze the statements:
1. **Barium has more valence electrons, and they are in a higher energy level.** - Incorrect, as barium has more valence electrons but they are in a lower energy level.
2. **Francium has fewer valence electrons, but they are in a higher energy level.** - Correct, as francium has 1 valence electron in a higher energy level than barium.
3. **Francium has more valence electrons, and they are in a higher energy level.** - Incorrect, as francium has fewer valence electrons.
4. **Barium has fewer valence electrons, but they are in a higher energy level.** - Incorrect, as barium has more valence electrons.
The correct statement is: **Francium has fewer valence electrons, but they are in a higher energy level.**