Question

1. check if each statement describes halogen or noble gas.

noble
gas
halogen
exist in all three states at room temperature

colorless and odorless at room temperature

has eight valence electrons

comes in a variety of colors

most reactive, especially with water, and reacts violently with the alkali metal family (group 1) to form
salts

has seven valence electrons

found in group 18

inert

found in group 17

Explanation:

• exist in all three states at room temperature: Halogens (e.g., bromine is liquid, iodine is solid, and chlorine is gas at room - temperature).
• colorless and odorless at room temperature: Noble gases (e.g., helium, neon).
• has eight valence electrons: Noble gases (except helium which has 2, but generally, they have a full valence shell).
• comes in a variety of colors: Halogens (e.g., chlorine is green - yellow, bromine is red - brown).
• most reactive, especially with water, and reacts violently with the alkali metal family (group 1) to form salts: Halogens (e.g., \(Cl_2 + 2Na

ightarrow 2NaCl\)).

• has seven valence electrons: Halogens (e.g., \(Cl: [Ne]3s^{2}3p^{5}\)).
• found in group 18: Noble gases.
• inert: Noble gases (due to their full valence shell, they have low reactivity).
• found in group 17: Halogens.

Answer:

• exist in all three states at room temperature: Halogen
• colorless and odorless at room temperature: Noble Gas
• has eight valence electrons: Noble Gas
• comes in a variety of colors: Halogen
• most reactive, especially with water, and reacts violently with the alkali metal family (group 1) to form salts: Halogen
• has seven valence electrons: Halogen
• found in group 18: Noble Gas
• inert: Noble Gas
• found in group 17: Halogen