Question

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.

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.

Answer 1

From the Periodic Table...

Francium is a group 1 Element and Barium is a Group 2 Element

This statement is a giveaway as it already tells you that Barium has more valence electrons than Francium since it has 2 electrons in its Outer shell.

This Eliminates Options A and B

Francium has more electrons than Barium

So It should be at a higher energy level.

Answer 2

The correct statement is Francium has fewer valence electrons, but they are in a higher energy level.

The energy level of an element is the region of space around the nucleus where its electrons are found. This corresponds to the period of the element in the periodic table.

• Francium is in period 7 in the periodic table (in energy level 7)

• Barium is in period 6 in the periodic table (in energy level 6)

• in the electronic configuration of Francium, the valence electron is in 7s¹

• in the electronic configuration of Barium, the valence electron is in 6s²

Thus, we can conclude that, Francium has fewer valence electrons, but they are in a higher energy level.

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