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Which statement correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba)?

(1 point)
Francium 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.
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.

1 answer

To compare the valence electrons for francium (Fr) and barium (Ba):

  • Francium (Fr) is in group 1 of the periodic table and has 1 valence electron.
  • Barium (Ba) is in group 2 of the periodic table and has 2 valence electrons.

Both elements are in the sixth period of the periodic table, meaning they have their valence electrons in the same principal energy level (n=6 for francium and n=6 for barium).

Therefore, the correct comparison is:

Francium has fewer valence electrons, but they are in a higher energy level. (This part is incorrect since they are in the same energy level. The correct statement should reflect the number of valence electrons only.)

So, the correct answer, based on accurate interpretation of their valences, is:

  • Francium has fewer valence electrons (1 vs. 2 for barium), but they are in the same energy level (n=6 for both).

From the options given, none reflects the correct answers given the criteria provided, but it’s crucial to note the energy levels when comparing their valence electrons.