[2026] PTE Academic Reading - Re-order paragraphs

Re-order paragraphs #0093

Re-order paragraphs

The text boxes below are in the wrong order. Arrange them in a correct order by dragging them to the appropriate numbered boxes.

The text boxes in the left panel have been placed in a random order. Restore the original order by dragging the text boxes from the left panel to the right panel. You can also reorder items in the right panel using the ▲▼ buttons.

Source

Dmitri Mendeleev’s publication of the first periodic table in 1869 revolutionized the field of chemistry by creating a systematic classification of elements.

He organized the known chemical substances into rows and columns based on their atomic weights and repeating chemical properties.

Significantly, Mendeleev noticed patterns that led him to leave deliberate gaps in the table for elements that had not yet been discovered.

His bold approach was validated years later when elements like gallium and germanium were found to possess the exact characteristics he had predicted.

Today, the periodic table remains the fundamental framework for understanding the behavior of matter at the molecular level.

Target

Drag sentences here →

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Highlights

ID:pt2751727861

Test No:#0093

Difficulty:Hard

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