Halogens

State the names of the elements in Group 7.

• Fluorine, Chlorine, Bromine, Iodine, Astatine

• Helium, Neon, Argon, Krypton, Xenon

• Lithium, Sodium, Potassium, Rubidium, Cesium

• Beryllium, Magnesium, Calcium, Strontium, Barium

Write the formula of the following compound: sodium iodide

• NaI

• NaCl

• NaBr

• NaF

Select the equation that represents the reaction of Chlorine with potassium iodide solution.

• Cl₂ + 2KI → 2KCl + I₂

• Cl₂ + KI → KCl + I₂

• 2Cl + 2KI → 2KCl + I₂

• Cl + KI → KCl + I

As the atomic number increases in Group 7, what happens to the color of the elements?

• The color becomes darker

• The color becomes lighter

• The color remains the same

• The color becomes more vibrant

Fill in the blank: The outer electrons are further from the nucleus as the group is descended as an extra energy level is added each time. This results in an increase in _______.

• atomic radius

• ionization energy

• electronegativity

• electron affinity

Fluorine and chlorine are gases, bromine is a liquid, and iodine is a solid at room temperature because:

• they have decreasing intermolecular forces.

• they have different molecular structures.

• they have increasing intermolecular forces.

• they have increasing covalent bonds.

Iodine sublimes on heating. Which of the following best explains what is meant by sublimation?

• The process of a solid turning directly into a gas without passing through the liquid state.

• The process of a solid melting into a liquid.

• The process of a gas turning into a liquid.

• The process of a liquid evaporating into a gas.

Fluorine has a higher electronegativity value than chlorine. Which of the following best defines electronegativity?

• The ability of an atom to attract electrons in a covalent bond.

• The energy required to remove an electron from an atom.

• The tendency of an atom to lose electrons.

• The ability of an atom to form covalent bonds.

Explain why the halogens should be used in a fume cupboard.

• Because they are beneficial for health when inhaled.

• Because even though they are non-reactive they can be harmful if inhaled.

• Because they are highly reactive and can be harmful if inhaled.

• Because they have no effect on the environment.

Iodine has a higher boiling point than bromine because:

• iodine molecules are larger and have stronger Van der Waals forces.

• iodine is more reactive than bromine.

• iodine has a higher atomic number than bromine.

• iodine is a solid at room temperature while bromine is a liquid.