C1 - Group 7 Halogens (part1)

What is another name for the Group 7 elements?

The halogens

Are Group 7 elements metals or non-metals

Non-metals

How many electrons do Group 7 elements have in their outer energy level?

7

Why do Group 7 atoms react?

To achieve a full outer energy level

What type of molecule do Group 7 elements form?

Diatomic molecules (molecules made of two atoms)

What is the formula for a fluorine molecule?

F₂

What type of bond joins the atoms in Group 7 molecules?

Covalent bond

What is a covalent bond?

A shared pair of electrons between two atoms

How do two halogen atoms bond together?

They share one pair of electrons to form a single covalent bond

How can a covalent bond be shown in a molecule diagram?

As a stick or line between the atoms

What is the formula for a chlorine molecule?

Cl₂

What is the physical state of fluorine at room temperature?

Gas

What is the physical state of chlorine at room temperature?

Gas

What is the physical state of bromine at room temperature?

Liquid

What is the physical state of iodine at room temperature?

Solid

What is the trend in melting points as you go down Group 7?

Melting points increase

What is the trend in boiling points as you go down Group 7?

Boiling points increase

Why are fluorine and chlorine gases at room temperature?

Their boiling points are below room temperature

Why is bromine a liquid at room temperature?

Its melting point is below room temperature but its boiling point is above

Why is iodine a solid at room temperature?

Its melting and boiling points are both above room temperature

What is room temperature approximately in degrees Celsius?

20°C

What is meant by "relative molecular mass"?

It is a measure of the size or mass of a molecule

What is the trend in relative molecular mass down Group 7?

It increases

Why do halogen molecules get larger as you move down the group?

Because the relative molecular mass increases