1. Give the number of protons, neutrons and electrons present in one atom of ¹⁴C.

• p = 6 n = 14 e = 6
• p = 6 n = 8 e = 6
• p = 14 n = 6 e = 14
• p = 6 n = 20 e = 6

2. Give the number of protons, neutrons and electrons present in ⁵⁵Fe³⁺.

• p = 26 n = 29 e = 26
• p = 55 n = 26 e = 55
• p = 26 n = 29 e = 23
• p = 26 n = 29 e = 29

3. What is the electron arrangement of Fe²⁺?

• [Ar] 3d⁴ 4s²
• [Ne] 3d⁴ 4s²
• [Ar] 3d⁶ 4s²
• [Ar] 3d⁵ 4s¹

4. What is the electron arrangement of Cu?

• [Ar] 3d⁹4s²
• [Ar] 3d¹⁰ 4s¹
• [Ne] 3d¹⁰ 4s¹
• [Ar] 3d⁹ 4s¹

5. What is the equation that represents the first ionisation energy of an atom?

• M_(g) - e -> M⁺_(g)
• M⁺_(g) -> M_(g) + e
• M_(g) - 2e -> M²_(g)
• M_(s) - e -> M⁺_(s)

6. As you go down a group what happens to the value of the first ionisation energy?

• It increases
• It remains the same
• It decreases
• In the s block it decreases, while in the p block it increases

7. When magnesium burns in oxygen the ionic compound magnesium oxide is formed. How are the ionic bonds formed?

• Two electrons move from the magnesium atoms to the oxygen atoms
• One electron moves from the magnesium atoms to the oxygen atoms
• Two electrons move from the oxygen atoms to the magnesium atoms
• Two electrons are shared between the magnesium atoms and the oxygen atoms

8. What type of bonding is present in SiH₄?

• hydrogen
• ionic
• dative
• covalent

9. What shape is a molecule of PCl₅?

• linear
• trigonal bipyramidal
• octahedral
• bent

10. What shape is a molecule of carbon dioxide?

• linear
• bent
• trigonal planar
• tetrahedral

11. Why is a molecule of water bent and not linear?

• There is one lone pair of electrons on the oxygen atom, which repels the O-H bonds
• The bond lengths of the two O-H bonds are not equal
• There are two lone pairs of electrons on the oxygen atom, which repel the O-H bonds
• Hydrogen bonding between water molecules causes a distortion