Periodic Table Group 7 and 8

Which statement about halogens is true?

• They get more reactive as you go down the group.

• They all exist as single atoms.

• They need to gain 1 electron to form a full outer shell.

• They form positive (+1) ions.

What is the most reactive halogen?

• Chlorine

• Fluorine

• Iodine

• Bromine

What happens to the melting and boiling points of halogens as you go down Group 7?

• They increase

• They decrease

• They stay the same

• It depends on the element

Which of these is a correct displacement reaction?

• Cl₂ + KBr → KCl + Br₂

• Br₂ + NaCl → NaBr + Cl₂

• I₂ + KBr → KI + Br₂

• Cl₂ + KI → KCl + I₂

Why do noble gases not form compounds easily?

• They are too small to react.

• They have full outer shells and are stable.

• They are too heavy.

• They dissolve in water easily.

Which noble gas is used in balloons?

• Argon

• Krypton

• Neon

• Helium

What happens to the density of noble gases as you go down Group 8?

• It decreases

• It increases

• It stays the same

• It depends on temperature

Which of these elements is a liquid at room temperature?

• Fluorine

• Bromine

• Chlorine

• Iodine

What do all Group 7 elements have in common?

• They have 7 electrons in their outer shell.

• They are all gases at room temperature.

• They are metals.

• They form positive (+1) ions.

Which statement about noble gases is false?

• They are colorless gases at room temperature.

• They form compounds easily.

• Their boiling points increase down the group.

• Argon is used in light bulbs.