Flashcard on Group 7 (Halogens)

Front

What are the elements in Group 7 known as?

Back

Halogens

Answer explanation

The elements in Group 7 of the periodic table are known as Halogens. They are characterized by their reactivity and include elements like fluorine, chlorine, and iodine.

Front

What is a property of halogens?

Back

They are diatomic

Answer explanation

Halogens, such as fluorine and chlorine, exist as diatomic molecules (e.g., F2, Cl2) in their natural state. They are not all gases, not all metals, and many are indeed poisonous, making 'they are diatomic' the correct property.

Front

What is the state of bromine at room temperature?

Back

Liquid

Answer explanation

Bromine is unique among the halogens as it is a liquid at room temperature, with a melting point of -7.2°C and a boiling point of 58.8°C. Therefore, the correct state of bromine at room temperature is liquid.

Front

Which halogen is the most reactive?

Back

Fluorine

Answer explanation

Fluorine is the most reactive halogen due to its high electronegativity and small atomic size, which allows it to attract electrons more effectively than chlorine, bromine, or iodine.

Front

What happens to the melting and boiling points of halogens as you go down the group?

Back

They increase

Answer explanation

As you go down the group of halogens, the melting and boiling points increase due to the greater atomic size and increased van der Waals forces, which require more energy to overcome.

Front

What color is chlorine in solution?

Back

Pale yellow-green

Answer explanation

Chlorine in solution appears as a pale yellow-green color. This characteristic hue is due to its molecular structure and the way it absorbs light, distinguishing it from other colors listed in the options.

Front

What type of bond is formed between two halogen atoms?

Back

Covalent bond

Answer explanation

A covalent bond is formed when two halogen atoms share electrons to achieve a full outer shell. This type of bond is typical for nonmetals, including halogens, making 'covalent bond' the correct answer.

Front

Which of the following halogens is a solid at room temperature? Fluorine, Bromine, Chlorine, Iodine

Back

Iodine

Answer explanation

Iodine is the only halogen that is a solid at room temperature, while fluorine, chlorine, and bromine are gases or liquids. This property is due to iodine's larger molecular size and stronger van der Waals forces.

Front

What is the charge of the halide ion?

Back

-1

Answer explanation

Halide ions are formed when halogens gain one electron, resulting in a charge of -1. This is because they have seven valence electrons and need one more to achieve a stable octet.

Front

Which halogen can displace iodine from potassium iodide?

Back

Chlorine

Answer explanation

Chlorine is more reactive than iodine and can displace it from potassium iodide. Bromine can also displace iodine, but it is less reactive than chlorine. Therefore, the correct answer is chlorine.