Helium is in group 18 of the periodic table. How is helium different from the other elements in this group?(1 point)

Question

Responses

Helium atoms have valence electrons in the first energy level, while atoms of the other elements in the group have valence electrons in the second energy level.
Helium atoms have valence electrons in the first energy level, while atoms of the other elements in the group have valence electrons in the second energy level.

Helium atoms have 2 valence electrons, while atoms of the other elements in the group all have 8 valence electrons.
Helium atoms have 2 valence electrons, while atoms of the other elements in the group all have 8 valence electrons.

Helium atoms have a full outer energy level, while atoms of the other elements in the group do not have a full outer energy level.
Helium atoms have a full outer energy level, while atoms of the other elements in the group do not have a full outer energy level.

Helium atoms have 2 electrons, while atoms of the other elements in the group all have 18 electrons.

Answer 1

The correct response is:

Helium atoms have valence electrons in the first energy level, while atoms of the other elements in the group have valence electrons in the second energy level.

This highlights the difference in the electron configuration of helium compared to other noble gases, which all have their valence electrons in the second energy level (for example, neon has 8 valence electrons in the second energy level). Helium has 2 electrons in the first energy level, making it unique among the noble gases.