A Chart of Every Element: Fill the Gap

Read about the periodic table, then fill each gap with the word the passage uses.

Story Brief #244

The Periodic Table is a chart that organizes all known chemical elements based on their properties and atomic structure.

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Find what matters in the words.

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Slow down. The first answer that pops up isn't always the right one.

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The Periodic Table is a chart that organizes all known chemical elements based on their properties and atomic structure. Each element is represented by a unique symbol, such as H for hydrogen or O for oxygen, and has a specific number called the atomic number, which indicates the number of protons in its nucleus. Elements are arranged in rows called periods and columns known as groups. For example, elements in the same group often share similar chemical properties.

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The first group contains alkali metals like lithium (Li) and sodium (Na), which are highly reactive. The Periodic Table not only helps scientists understand the relationships between different elements but also predicts how they will react with one another. For instance, sodium reacts violently with water, while chlorine gas is a toxic element that can combine with sodium to form table salt (NaCl).

Question 1

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Which word does the passage use to complete this sentence? “The first group _____ alkali metals like lithium (Li) and sodium (Na), which are highly reactive.”

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Question 2

2 of 2

Which word does the passage use to complete this sentence? “The Periodic Table not only helps scientists understand the _____ between different elements but also predicts how they will react with one another.”

How sure are you going to be?😐 maybe

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You got 0 of 2 right.

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A Chart of Every Element: Fill the Gap

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