Periodic Table

Group I elements also known as

Group VII elements also known as

Group O elements are chemically inert because their atoms have stable ....... ......... (2 words)

Caecium is from Group I. Which property is it likely to have?

• hard, high density, low melting point.

• hard, high density, high melting point.

• soft, low density, low melting point.

• soft, low density, high melting point.

Which property generally decreases when going across a period in Periodic Table, from Group I to VII?

• Softness of elements

• Number of electrons in valence shells

• Melting point of elements

• Tendency of elements to form positive ions

Sodium is the second element and caesium is the fifth element in Group I in Periodic Table. Which statement is correct?

• Sodium has fewer electrons in outermost shell than that of caesium.

• Sodium has high boiling point than caesium.

• Sodium can be cut by knife but not caesium.

• Sodium reacts more rapidly than caesium.

Astatine is a Group VII element below iodine. Which statement below is not correct?

• It is a solid at room temperature and pressure.

• It is a stronger oxidising agent than iodine.

• It reacts with Group I elements to form ionic compound.

• Its diatomic molecules are held together by weak intermolecular force of attraction.

P, Q, R, S are 4 consecutive elements from Periodic Table. If Q is a noble gas, which of the following formulae is correct?

• RP

• S₂P

• R₂S

• RQ

Magnesium and barium have similar chemical properties because

• they both form cations.

• their atoms are of similar size.

• their atoms have 2 electrons in the outermost shell.

• they are both metals.

Which statement about "groups" in periodic table is correct?

• All elements in the same group form either positive or negative ions.

• In Group I, all elements form covalent compound with hydrogen.

• All Group VII elements form ionic bonds with Group II elements.

• All groups contain acidic and basic oxide.