Year 10 Science: Exam revision 2025 - Periodic Table

Which of the following correctly groups the substances into elements and compounds: CO₂, O₂, H₂O, Fe, NaCl, N₂, NH₃?

• Elements: O₂, Fe, N₂; Compounds: CO₂, H₂O, NaCl, NH₃

• Elements: CO₂, O₂, Fe; Compounds: H₂O, NaCl, N₂, NH₃

• Elements: O₂, H₂O, N₂; Compounds: CO₂, Fe, NaCl, NH₃

• Elements: CO₂, NaCl, N₂; Compounds: O₂, H₂O, Fe, NH₃

Which of the following correctly defines the term 'atomic number'?

• The number of protons in the nucleus of an atom

• The total number of protons and neutrons in an atom

• An atom that has gained or lost electrons

• The number of electrons in the outer shell

Which of the following best describes what the group and period of an element indicate?

• The group tells you the number of valence electrons, and the period tells you the number of electron shells.

• The group tells you the atomic mass, and the period tells you the atomic number.

• The group tells you the number of protons, and the period tells you the number of neutrons.

• The group tells you the number of isotopes, and the period tells you the number of ions.

Elements in the same group or elements in the same period will react in a similar manner.

• Elements in the same group

• Elements in the same period

• Elements with similar atomic numbers

• Elements with different valencies

On the periodic table, where are the alkali and alkaline each metals located?

• On the left side

• In the center

• On the right side

• At the bottom

Calcium has the electron configuration 2, 8, 8, 2. Which period and group will it be found in?

• Period 4, Group 2

• Period 5, Group 1

• Period 2, Group 4

• Period 2, Group 1

Which of the following statements is correct?

• Covalent bonds are formed by non-metals, and ionic bonds are formed by metals and non-metals.

• Covalent bonds are formed by metals, and ionic bonds are formed by non-metals.

• Both covalent and ionic bonds are formed only by metals.

• Both covalent and ionic bonds are formed only by non-metals.

Identify two common covalent compounds from the following options.

• Water (H₂O) and Carbon Dioxide (CO₂)

• Sodium Chloride (NaCl) and Water (H₂O)

• Calcium Carbonate (CaCO₃) and Sodium Chloride (NaCl)

• Magnesium Oxide (MgO) and Calcium Carbonate (CaCO₃)

The characteristic for metallic bonds is:

• the presence of a sea of delocalized electrons

• the sharing of electron pairs between atoms

• the transfer of electrons from one atom to another

• the formation of molecules with fixed shapes

Identify the type of ion that ₁₁Na will form.

• Na will form a cation with a +1 charge.

• Na will form an anion with a -1 charge.

• Na will form a cation with a +2 charge.

• Na will form an anion with a +2 charge.