CIE iGCSE Co-Ordinated Science C8.1 Arrangement of elements Exam Style Questions Paper 1
Question
When a small piece of potassium is placed in water, hydrogen gas is given off very quickly. Which element reacts in a similar way?
A copper
B iron
C magnesium
D sodium
▶️Answer/Explanation
Answer: D sodium
Explanation: Sodium, like potassium, is an alkali metal and reacts vigorously with water to produce hydrogen gas. Both elements are in Group 1 of the Periodic Table, which means they have similar chemical properties, including their reactivity with water.
Question
Part of the Periodic Table is shown.
Which statement is not correct?
A W and X are metallic elements.
B W and Z form an ionic compound.
C X and Y form a covalent compound.
D Z is a non-metallic element.
▶Answer/Explanation
Answer: C
Explanation: X and Y are both non-metals, so they would form a covalent compound, not an ionic one. The other statements are correct.
Question
The diagram shows overlapping circles into which different chemical formulae can be placed.
Which formula can be placed in the shaded area because it has all three properties?
A Br2 B CO C Cu D Na
▶️Answer/Explanation
Ans : C
Question
Which element is used in the manufacture of sulfuric acid?
A carbon
B hydrogen
C nitrogen
D sulfur
▶️Answer/Explanation
Ans : D
Question
Which statement about elements in the Periodic Table is correct?
A. The density of the elements in Group I increases up the group.
B. The metallic character of the elements increases across a period from left to right.
C. The number of protons in the atoms of the elements increases across a period from left to right.
D. The reactivity of the elements in Group I decreases down the group.
▶️Answer/Explanation
Answer: C. The number of protons in the atoms of the elements increases across a period from left to right.
Explanation: The number of protons (atomic number) increases as you move across a period from left to right. This is a fundamental property of the Periodic Table.
Question
Which statement about the Periodic Table is correct?
A Elements are listed in order of neutron number.
B Elements are listed in order of nucleon number.
C Elements are listed in order of proton number.
D Elements are listed in order of relative atomic mass.
▶️Answer/Explanation
Answer: C
Explanation: Elements in the Periodic Table are arranged in order of increasing proton number (atomic number).
Question
Which statement about the trends in the Periodic Table is correct?
A. Elements are arranged in order of nucleon number.
B. Elements on the left-hand side form acidic oxides.
C. The melting point of the Group I elements increases down the group.
D. The proton number increases from left to right across the table.
▶️Answer/Explanation
Answer: D
Explanation: The proton number (atomic number) increases from left to right across the Periodic Table. This is the fundamental basis for the arrangement of elements in the Periodic Table.