What is the main idea of this passage?

• The history of the universe and the Big Bang.

• The properties and organization of the Periodic Table.

• The careers of Dr. Maria Gomez and Dr. Alan Turing.

• The chemical reactions of alkali metals and noble gases.

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Main idea

What is the author's purpose in writing this passage?

• To argue that the Periodic Table is outdated.

• To inform about the structure and significance of the Periodic Table.

• To persuade readers to study chemistry.

• To entertain with stories about elements.

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Author's purpose

Based on the passage, what can be inferred about noble gases?

• They are the heaviest elements on the Periodic Table.

• They are highly reactive with other elements.

• They do not easily react with other elements.

• They are only found in the universe, not on Earth.

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Evidence and inferences

How is the information in the passage organized?

• By chronological order of element discovery.

• By comparing and contrasting different elements.

• By grouping elements according to their properties.

• By listing elements alphabetically.

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Text structure