11.1Physical Properties of the Group 17 Elements

These flashcards cover key concepts and properties related to Group 17 elements (halogens), including their physical properties, volatility, bond strengths, and molecular interactions.

What are the Group 17 elements commonly known as?

Halogens.

What happens to the color of halogens as you go down the group?

The colors get darker.

Define volatility in the context of the Group 17 elements.

Volatility refers to how easily a substance can evaporate; a volatile substance will have a low melting and boiling point.

How do the melting and boiling points of Group 17 elements change as you move down the group?

They increase.

What is the relationship between bond strength and atomic size in Group 17?

As atomic size increases, bond strength decreases.

What is bond enthalpy?

The heat needed to break one mole of a covalent bond.

What unique property does fluorine exhibit compared to chlorine and bromine in terms of bond enthalpy?

Fluorine has a smaller bond enthalpy than chlorine and bromine despite being higher in the group.

What type of molecular structure do halogens have at room temperature?

They exist as diatomic molecules.

What is the cause of van der Waals' forces in nonpolar molecules?

They are caused by instantaneous dipole-induced dipole forces.

How does the number of electrons in a molecule affect van der Waals' forces?

More electrons increase the strength of the instantaneous dipole-induced dipole forces.