Atomic structure

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Question 37
Medium

Mendeleev arranged the elements in his early periodic table in order of increasing relative atomic mass, but had to swap some elements to group those with similar properties together.

a.

Explain why arranging elements by relative atomic mass does not always correspond to the correct order of elements.

[2]
b.

Identify one pair of elements in the modern Periodic Table that are not in order of increasing relative atomic mass. Write down their chemical symbols.

[2]
c.

The diagram below shows a simplified version of the modern periodic table. The letters A, B, C, and D are temporary labels and do not represent the actual chemical symbols of the elements.

A simplified modern periodic table outline. Grid consists of 7 horizontal periods and 18 vertical columns. Row 1 has blocks at column 1 and column 18. Row 2 has blocks at columns 1, 2, and 13 to 18. Row 3 has blocks at columns 1, 2, and 13 to 18; the cell at Row 3, Column 1 has the letter 'A' inside, and the cell at Row 3, Column 17 has the letter 'B' inside. Row 4 has blocks at columns 1 to 18; the cell at Row 4, Column 10 has the letter 'D' inside, and the cell at Row 4, Column 18 has the letter 'C' inside. Row 5, 6, and 7 represent the lower periods of the s-block, d-block, and p-block in standard arrangement.

Which element (A, B, C, or D) is a highly reactive non-metal that forms ions with a 1−1-1−. charge? Explain your answer.

[2]
d.

The diagram below shows a simplified version of the modern periodic table. The letters A, B, C, and D are temporary labels and do not represent the actual chemical symbols of the elements.

A simplified modern periodic table outline. Grid consists of 7 horizontal periods and 18 vertical columns. Row 1 has blocks at column 1 and column 18. Row 2 has blocks at columns 1, 2, and 13 to 18. Row 3 has blocks at columns 1, 2, and 13 to 18; the cell at Row 3, Column 1 has the letter 'A' inside, and the cell at Row 3, Column 17 has the letter 'B' inside. Row 4 has blocks at columns 1 to 18; the cell at Row 4, Column 10 has the letter 'D' inside, and the cell at Row 4, Column 18 has the letter 'C' inside. Row 5, 6, and 7 represent the lower periods of the s-block, d-block, and p-block in standard arrangement.

Which element (A, B, C, or D) is a highly reactive metal that reacts vigorously with water to form an alkaline solution? Explain your answer.

[2]

Atomic structure Questions

  1. GCSE
  2. /Chemistry
  3. /Atomic structure