The Periodic Table

Which one of the following names does not correspond to a group of elements on the Periodic Table?

• Alkali

• halogens

• metalloid

• noble gas

Which property of elements increases as you move across the Periodic Table?

• The number of outer shells increases

• The number of outer shell electrons increases

• The metallic character

• The tendency to become positive ion

Element Z forms an ion with a 2- charge. Which group of the Periodic Table is element Z found in?

• 1

• 2

• 6

• 7

Element X is found in Group 7 of the Periodic Table. Which properties are typical of element X?

1. Poor conductor of electricity

2. malleable

3. High melting points

4. Form acidic oxides

• 1 and 2

• 1 and 4

• 2 and 3

• 3 and 4

Potassium has a lower relative atomic mass than argon but on the Periodic Table potassium appears after argon.

Why is potassium placed after argon?

• Argon has less neutrons than potassium

• Argon has more protons than potassium

• Potassium has more protons than argon

• Potassium has more neutrons than argon

Oxygen, sulfur, selenium and tellurium are Group VI elements. What do all these elements have in common?

• They all have 6 outer shell electrons and have similar physical properties.

• They are all non-metals.

• They all have 5 outer shell electrons and have similar chemical properties.

• They all have 6 outer shell electrons and have similar chemical properties.

Which statement about the Alkali metals is correct?

• Potassium is more dense than lithium.

• Lithium has a higher density than sodium.

• Potassium is less reactive than sodium.

• The melting point of sodium is higher than lithium.

The reactivity of the alkali metals increases moving down the group. Which statement explains this observation?

• Decreasing distance between the nucleus and outer shell makes it easier for the metals to lose their valence electrons.

• Increasing distance between the nucleus and outer shell makes it harder for the metals to lose their valence electrons.

• Increasing distance between the nucleus and outer shell makes it easier for the metals to lose their valence electrons.

• Decreasing distance between the nucleus and outer shell makes it harder for the metals to lose their valence electrons.

A solution of LiX (X is a halogen) and another halogen Y are mixed together. A reaction occurs and the mixture darkens in colour. What is the mixture?

• Bromine and lithium chloride

• Bromine and lithium fluoride

• Chlorine and lithium iodide

• Chlorine and lithium fluoride